diff --git a/lib/std/Progress.zig b/lib/std/Progress.zig
index ba60f9123365..e99b298c1ed5 100644
--- a/lib/std/Progress.zig
+++ b/lib/std/Progress.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! This API non-allocating, non-fallible, and thread-safe.
 //! The tradeoff is that users of this API must provide the storage
 //! for each `Progress.Node`.
diff --git a/lib/std/SemanticVersion.zig b/lib/std/SemanticVersion.zig
index 17d5b6557160..fb09f85ff253 100644
--- a/lib/std/SemanticVersion.zig
+++ b/lib/std/SemanticVersion.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A software version formatted according to the Semantic Version 2 specification.
 //!
 //! See: https://semver.org
diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
index b4232d695532..3c0a53612c49 100644
--- a/lib/std/Thread.zig
+++ b/lib/std/Thread.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! This struct represents a kernel thread, and acts as a namespace for concurrency
 //! primitives that operate on kernel threads. For concurrency primitives that support
 //! both evented I/O and async I/O, see the respective names in the top level std namespace.
diff --git a/lib/std/Thread/AutoResetEvent.zig b/lib/std/Thread/AutoResetEvent.zig
index 13e404d60277..49639d60e9d3 100644
--- a/lib/std/Thread/AutoResetEvent.zig
+++ b/lib/std/Thread/AutoResetEvent.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Similar to `StaticResetEvent` but on `set()` it also (atomically) does `reset()`.
 //! Unlike StaticResetEvent, `wait()` can only be called by one thread (MPSC-like).
 //!
diff --git a/lib/std/Thread/Condition.zig b/lib/std/Thread/Condition.zig
index 9513e794edaf..647a50b9136c 100644
--- a/lib/std/Thread/Condition.zig
+++ b/lib/std/Thread/Condition.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A condition provides a way for a kernel thread to block until it is signaled
 //! to wake up. Spurious wakeups are possible.
 //! This API supports static initialization and does not require deinitialization.
diff --git a/lib/std/Thread/Futex.zig b/lib/std/Thread/Futex.zig
index a896942d6ea7..5a3da5cd9489 100644
--- a/lib/std/Thread/Futex.zig
+++ b/lib/std/Thread/Futex.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Futex is a mechanism used to block (`wait`) and unblock (`wake`) threads using a 32bit memory address as hints.
 //! Blocking a thread is acknowledged only if the 32bit memory address is equal to a given value.
 //! This check helps avoid block/unblock deadlocks which occur if a `wake()` happens before a `wait()`.
diff --git a/lib/std/Thread/Mutex.zig b/lib/std/Thread/Mutex.zig
index 522d1fe4183d..ee54a1582bbf 100644
--- a/lib/std/Thread/Mutex.zig
+++ b/lib/std/Thread/Mutex.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Lock may be held only once. If the same thread tries to acquire
 //! the same mutex twice, it deadlocks.  This type supports static
 //! initialization and is at most `@sizeOf(usize)` in size.  When an
diff --git a/lib/std/Thread/ResetEvent.zig b/lib/std/Thread/ResetEvent.zig
index bbf9e7263a0c..d9304dd70b76 100644
--- a/lib/std/Thread/ResetEvent.zig
+++ b/lib/std/Thread/ResetEvent.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A thread-safe resource which supports blocking until signaled.
 //! This API is for kernel threads, not evented I/O.
 //! This API requires being initialized at runtime, and initialization
diff --git a/lib/std/Thread/RwLock.zig b/lib/std/Thread/RwLock.zig
index 0721aad3f7cc..cfe06c76e802 100644
--- a/lib/std/Thread/RwLock.zig
+++ b/lib/std/Thread/RwLock.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A lock that supports one writer or many readers.
 //! This API is for kernel threads, not evented I/O.
 //! This API requires being initialized at runtime, and initialization
diff --git a/lib/std/Thread/Semaphore.zig b/lib/std/Thread/Semaphore.zig
index 169975b3626e..b5bde88d736a 100644
--- a/lib/std/Thread/Semaphore.zig
+++ b/lib/std/Thread/Semaphore.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A semaphore is an unsigned integer that blocks the kernel thread if
 //! the number would become negative.
 //! This API supports static initialization and does not require deinitialization.
diff --git a/lib/std/Thread/StaticResetEvent.zig b/lib/std/Thread/StaticResetEvent.zig
index e15a6a0a5435..d779a4de9e2c 100644
--- a/lib/std/Thread/StaticResetEvent.zig
+++ b/lib/std/Thread/StaticResetEvent.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! A thread-safe resource which supports blocking until signaled.
 //! This API is for kernel threads, not evented I/O.
 //! This API is statically initializable. It cannot fail to be initialized
diff --git a/lib/std/array_hash_map.zig b/lib/std/array_hash_map.zig
index 4ca603d2e889..37612a1266b5 100644
--- a/lib/std/array_hash_map.zig
+++ b/lib/std/array_hash_map.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/array_list.zig b/lib/std/array_list.zig
index 1e74d34922a8..f6ee5cdad26c 100644
--- a/lib/std/array_list.zig
+++ b/lib/std/array_list.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/ascii.zig b/lib/std/ascii.zig
index afaf9f8ca473..c999162b3643 100644
--- a/lib/std/ascii.zig
+++ b/lib/std/ascii.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Does NOT look at the locale the way C89's toupper(3), isspace() et cetera does.
 // I could have taken only a u7 to make this clear, but it would be slower
 // It is my opinion that encodings other than UTF-8 should not be supported.
diff --git a/lib/std/atomic.zig b/lib/std/atomic.zig
index 42d57eb8fa10..95d218736a82 100644
--- a/lib/std/atomic.zig
+++ b/lib/std/atomic.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std.zig");
 const target = std.Target.current;
 
diff --git a/lib/std/atomic/Atomic.zig b/lib/std/atomic/Atomic.zig
index f4e3ebda9dfc..deb364b7d3d7 100644
--- a/lib/std/atomic/Atomic.zig
+++ b/lib/std/atomic/Atomic.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../std.zig");
 
 const testing = std.testing;
diff --git a/lib/std/atomic/queue.zig b/lib/std/atomic/queue.zig
index cee431951c1b..f3781b4ce792 100644
--- a/lib/std/atomic/queue.zig
+++ b/lib/std/atomic/queue.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/atomic/stack.zig b/lib/std/atomic/stack.zig
index cfdf40fa60c2..a1747db0f572 100644
--- a/lib/std/atomic/stack.zig
+++ b/lib/std/atomic/stack.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const assert = std.debug.assert;
 const builtin = std.builtin;
 const expect = std.testing.expect;
diff --git a/lib/std/base64.zig b/lib/std/base64.zig
index 4b01455112da..7e593900e6ce 100644
--- a/lib/std/base64.zig
+++ b/lib/std/base64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/bit_set.zig b/lib/std/bit_set.zig
index 261c6af2dfa3..dd8afb4168ea 100644
--- a/lib/std/bit_set.zig
+++ b/lib/std/bit_set.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! This file defines several variants of bit sets.  A bit set
 //! is a densely stored set of integers with a known maximum,
 //! in which each integer gets a single bit.  Bit sets have very
diff --git a/lib/std/bounded_array.zig b/lib/std/bounded_array.zig
index 33216969bf03..587251458eac 100644
--- a/lib/std/bounded_array.zig
+++ b/lib/std/bounded_array.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/buf_map.zig b/lib/std/buf_map.zig
index 3494fce0323f..1e4462e6aee4 100644
--- a/lib/std/buf_map.zig
+++ b/lib/std/buf_map.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = std.mem;
diff --git a/lib/std/buf_set.zig b/lib/std/buf_set.zig
index c2a1f9bcb97d..ce2d51b0569c 100644
--- a/lib/std/buf_set.zig
+++ b/lib/std/buf_set.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = @import("mem.zig");
diff --git a/lib/std/build.zig b/lib/std/build.zig
index 013770bbece6..1533f9308596 100644
--- a/lib/std/build.zig
+++ b/lib/std/build.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/build/CheckFileStep.zig b/lib/std/build/CheckFileStep.zig
index 1f1ed0884ea2..2b433b5448cc 100644
--- a/lib/std/build/CheckFileStep.zig
+++ b/lib/std/build/CheckFileStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/FmtStep.zig b/lib/std/build/FmtStep.zig
index 82faf32be903..62923623f2aa 100644
--- a/lib/std/build/FmtStep.zig
+++ b/lib/std/build/FmtStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/build/InstallRawStep.zig b/lib/std/build/InstallRawStep.zig
index 743b25f3cdea..39a2d2984554 100644
--- a/lib/std/build/InstallRawStep.zig
+++ b/lib/std/build/InstallRawStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/build/RunStep.zig b/lib/std/build/RunStep.zig
index 89d9cd911cb2..67929b6f5d6b 100644
--- a/lib/std/build/RunStep.zig
+++ b/lib/std/build/RunStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const build = std.build;
diff --git a/lib/std/build/TranslateCStep.zig b/lib/std/build/TranslateCStep.zig
index 2f209b80b423..0d44ebd80a88 100644
--- a/lib/std/build/TranslateCStep.zig
+++ b/lib/std/build/TranslateCStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/WriteFileStep.zig b/lib/std/build/WriteFileStep.zig
index 12879421103a..5a8d806049eb 100644
--- a/lib/std/build/WriteFileStep.zig
+++ b/lib/std/build/WriteFileStep.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index caf32890b621..bb35d6137518 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 
 // These are all deprecated.
diff --git a/lib/std/c.zig b/lib/std/c.zig
index 700a1dc25090..0ad69f873fde 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const page_size = std.mem.page_size;
diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index 117172fc7b4e..7fa07719a886 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const builtin = @import("builtin");
diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index 7d722dad4437..e5786d2bd400 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 extern "c" threadlocal var errno: c_int;
diff --git a/lib/std/c/emscripten.zig b/lib/std/c/emscripten.zig
index 526eb9e99c1a..0d78d4d73f27 100644
--- a/lib/std/c/emscripten.zig
+++ b/lib/std/c/emscripten.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(4) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index eb449165d34a..f7d1e07608db 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 
diff --git a/lib/std/c/fuchsia.zig b/lib/std/c/fuchsia.zig
index fc34f49d2249..af6c4756b9ee 100644
--- a/lib/std/c/fuchsia.zig
+++ b/lib/std/c/fuchsia.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/haiku.zig b/lib/std/c/haiku.zig
index fcf99db57158..be6c180bed05 100644
--- a/lib/std/c/haiku.zig
+++ b/lib/std/c/haiku.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //
 const std = @import("../std.zig");
 const builtin = std.builtin;
diff --git a/lib/std/c/hermit.zig b/lib/std/c/hermit.zig
index a159395ab367..ae13840e1656 100644
--- a/lib/std/c/hermit.zig
+++ b/lib/std/c/hermit.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     inner: usize = ~@as(usize, 0),
 };
diff --git a/lib/std/c/linux.zig b/lib/std/c/linux.zig
index 2ce98e2246c5..808b05bd6db7 100644
--- a/lib/std/c/linux.zig
+++ b/lib/std/c/linux.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const maxInt = std.math.maxInt;
 const abi = std.Target.current.abi;
diff --git a/lib/std/c/minix.zig b/lib/std/c/minix.zig
index 3f03d31ed547..9c644a79867c 100644
--- a/lib/std/c/minix.zig
+++ b/lib/std/c/minix.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 07af1dc68985..e45dc85d34eb 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 15820fb0a935..e5ded7f3fb83 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 
diff --git a/lib/std/c/solaris.zig b/lib/std/c/solaris.zig
index ed043018d0fd..7c70a01fc4ac 100644
--- a/lib/std/c/solaris.zig
+++ b/lib/std/c/solaris.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     __pthread_mutex_flag1: u16 = 0,
     __pthread_mutex_flag2: u8 = 0,
diff --git a/lib/std/c/tokenizer.zig b/lib/std/c/tokenizer.zig
index f8709e12bea5..9ad5ab0179e9 100644
--- a/lib/std/c/tokenizer.zig
+++ b/lib/std/c/tokenizer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/c/wasi.zig b/lib/std/c/wasi.zig
index 0edc77de3780..339bdcd127f5 100644
--- a/lib/std/c/wasi.zig
+++ b/lib/std/c/wasi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../os/bits.zig");
 
 extern threadlocal var errno: c_int;
diff --git a/lib/std/c/windows.zig b/lib/std/c/windows.zig
index bed2e421ff03..a10715f0830e 100644
--- a/lib/std/c/windows.zig
+++ b/lib/std/c/windows.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub extern "c" fn _errno() *c_int;
 
 pub extern "c" fn _msize(memblock: ?*c_void) usize;
diff --git a/lib/std/child_process.zig b/lib/std/child_process.zig
index 3f3fa9c754d0..7d8881a67995 100644
--- a/lib/std/child_process.zig
+++ b/lib/std/child_process.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const cstr = std.cstr;
 const unicode = std.unicode;
diff --git a/lib/std/coff.zig b/lib/std/coff.zig
index 8b00a2429702..6caf214728f5 100644
--- a/lib/std/coff.zig
+++ b/lib/std/coff.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = std.builtin;
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/compress.zig b/lib/std/compress.zig
index 972031c182c8..f4db3fecd5a6 100644
--- a/lib/std/compress.zig
+++ b/lib/std/compress.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 
 pub const deflate = @import("compress/deflate.zig");
diff --git a/lib/std/compress/deflate.zig b/lib/std/compress/deflate.zig
index d7209981ce0a..b443c2971f3e 100644
--- a/lib/std/compress/deflate.zig
+++ b/lib/std/compress/deflate.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // Decompressor for DEFLATE data streams (RFC1951)
 //
diff --git a/lib/std/compress/gzip.zig b/lib/std/compress/gzip.zig
index 6f1760194932..497b07d905e2 100644
--- a/lib/std/compress/gzip.zig
+++ b/lib/std/compress/gzip.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // Decompressor for GZIP data streams (RFC1952)
 
diff --git a/lib/std/compress/zlib.zig b/lib/std/compress/zlib.zig
index 909bae409058..f0f4ca2ff4d9 100644
--- a/lib/std/compress/zlib.zig
+++ b/lib/std/compress/zlib.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // Decompressor for ZLIB data streams (RFC1950)
 
diff --git a/lib/std/comptime_string_map.zig b/lib/std/comptime_string_map.zig
index 6e8f190bc48b..09ba4e5a3caf 100644
--- a/lib/std/comptime_string_map.zig
+++ b/lib/std/comptime_string_map.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/crypto.zig b/lib/std/crypto.zig
index 84b291d57ef0..e00e331b4607 100644
--- a/lib/std/crypto.zig
+++ b/lib/std/crypto.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 /// Authenticated Encryption with Associated Data
 pub const aead = struct {
     pub const aegis = struct {
diff --git a/lib/std/crypto/25519/curve25519.zig b/lib/std/crypto/25519/curve25519.zig
index 9b8cecb91762..44a19362e4e3 100644
--- a/lib/std/crypto/25519/curve25519.zig
+++ b/lib/std/crypto/25519/curve25519.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const crypto = std.crypto;
 
diff --git a/lib/std/crypto/25519/ed25519.zig b/lib/std/crypto/25519/ed25519.zig
index 4940f0dee6cb..a6ac956183af 100644
--- a/lib/std/crypto/25519/ed25519.zig
+++ b/lib/std/crypto/25519/ed25519.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/25519/edwards25519.zig b/lib/std/crypto/25519/edwards25519.zig
index 15af616d602e..7e58692e63a5 100644
--- a/lib/std/crypto/25519/edwards25519.zig
+++ b/lib/std/crypto/25519/edwards25519.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/25519/field.zig b/lib/std/crypto/25519/field.zig
index 1d67f0a90239..277fb98d5cea 100644
--- a/lib/std/crypto/25519/field.zig
+++ b/lib/std/crypto/25519/field.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const crypto = std.crypto;
 const readIntLittle = std.mem.readIntLittle;
diff --git a/lib/std/crypto/25519/ristretto255.zig b/lib/std/crypto/25519/ristretto255.zig
index dea6193fca2e..e33bdb496d07 100644
--- a/lib/std/crypto/25519/ristretto255.zig
+++ b/lib/std/crypto/25519/ristretto255.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 
diff --git a/lib/std/crypto/25519/scalar.zig b/lib/std/crypto/25519/scalar.zig
index bea054234efd..9582a888f0f9 100644
--- a/lib/std/crypto/25519/scalar.zig
+++ b/lib/std/crypto/25519/scalar.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/crypto/25519/x25519.zig b/lib/std/crypto/25519/x25519.zig
index 5109fd7c2a95..d935513ab6ab 100644
--- a/lib/std/crypto/25519/x25519.zig
+++ b/lib/std/crypto/25519/x25519.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const crypto = std.crypto;
 const mem = std.mem;
diff --git a/lib/std/crypto/aegis.zig b/lib/std/crypto/aegis.zig
index 194b6de8f5ce..68062c537e2a 100644
--- a/lib/std/crypto/aegis.zig
+++ b/lib/std/crypto/aegis.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const mem = std.mem;
 const assert = std.debug.assert;
diff --git a/lib/std/crypto/aes.zig b/lib/std/crypto/aes.zig
index 7d6e0d1e84bf..18bae3978ef7 100644
--- a/lib/std/crypto/aes.zig
+++ b/lib/std/crypto/aes.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../std.zig");
 const testing = std.testing;
 const builtin = std.builtin;
diff --git a/lib/std/crypto/aes/aesni.zig b/lib/std/crypto/aes/aesni.zig
index 7fbbaac7e881..94c7f5efc6f6 100644
--- a/lib/std/crypto/aes/aesni.zig
+++ b/lib/std/crypto/aes/aesni.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 const mem = std.mem;
 const debug = std.debug;
diff --git a/lib/std/crypto/aes/armcrypto.zig b/lib/std/crypto/aes/armcrypto.zig
index 4d16b2f68011..cee5b9bccbf7 100644
--- a/lib/std/crypto/aes/armcrypto.zig
+++ b/lib/std/crypto/aes/armcrypto.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 const mem = std.mem;
 const debug = std.debug;
diff --git a/lib/std/crypto/aes/soft.zig b/lib/std/crypto/aes/soft.zig
index 0d8a56679312..bc9a994b95ab 100644
--- a/lib/std/crypto/aes/soft.zig
+++ b/lib/std/crypto/aes/soft.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Based on Go stdlib implementation
 
 const std = @import("../../std.zig");
diff --git a/lib/std/crypto/aes_gcm.zig b/lib/std/crypto/aes_gcm.zig
index 492a1a5223c1..2d1cefaa3130 100644
--- a/lib/std/crypto/aes_gcm.zig
+++ b/lib/std/crypto/aes_gcm.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const assert = std.debug.assert;
 const builtin = std.builtin;
diff --git a/lib/std/crypto/aes_ocb.zig b/lib/std/crypto/aes_ocb.zig
index 6aaa7fc8cb27..69c34afcdac1 100644
--- a/lib/std/crypto/aes_ocb.zig
+++ b/lib/std/crypto/aes_ocb.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const crypto = std.crypto;
 const aes = crypto.core.aes;
diff --git a/lib/std/crypto/bcrypt.zig b/lib/std/crypto/bcrypt.zig
index 7d56350664b5..d8c4d67453c7 100644
--- a/lib/std/crypto/bcrypt.zig
+++ b/lib/std/crypto/bcrypt.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/benchmark.zig b/lib/std/crypto/benchmark.zig
index efaca227c13c..7d55b95a3f3d 100644
--- a/lib/std/crypto/benchmark.zig
+++ b/lib/std/crypto/benchmark.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --zig-lib-dir ..
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/blake2.zig b/lib/std/crypto/blake2.zig
index e0b9eff5b90b..e2107dda56f6 100644
--- a/lib/std/crypto/blake2.zig
+++ b/lib/std/crypto/blake2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const math = std.math;
diff --git a/lib/std/crypto/blake3.zig b/lib/std/crypto/blake3.zig
index 75aba06da0c5..6a2950645a3b 100644
--- a/lib/std/crypto/blake3.zig
+++ b/lib/std/crypto/blake3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Translated from BLAKE3 reference implementation.
 // Source: https://github.com/BLAKE3-team/BLAKE3
 
diff --git a/lib/std/crypto/chacha20.zig b/lib/std/crypto/chacha20.zig
index 592116ddd4ac..11496034a06f 100644
--- a/lib/std/crypto/chacha20.zig
+++ b/lib/std/crypto/chacha20.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Based on public domain Supercop by Daniel J. Bernstein
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/ghash.zig b/lib/std/crypto/ghash.zig
index b9a7e48adc1e..704ed367f049 100644
--- a/lib/std/crypto/ghash.zig
+++ b/lib/std/crypto/ghash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // Adapted from BearSSL's ctmul64 implementation originally written by Thomas Pornin <pornin@bolet.org>
 
diff --git a/lib/std/crypto/gimli.zig b/lib/std/crypto/gimli.zig
index 7aa67212e4ff..c2342137043d 100644
--- a/lib/std/crypto/gimli.zig
+++ b/lib/std/crypto/gimli.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Gimli is a 384-bit permutation designed to achieve high security with high
 // performance across a broad range of platforms, including 64-bit Intel/AMD
 // server CPUs, 64-bit and 32-bit ARM smartphone CPUs, 32-bit ARM
diff --git a/lib/std/crypto/hkdf.zig b/lib/std/crypto/hkdf.zig
index 81c541231dd7..8de3052a0b08 100644
--- a/lib/std/crypto/hkdf.zig
+++ b/lib/std/crypto/hkdf.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const hmac = std.crypto.auth.hmac;
diff --git a/lib/std/crypto/hmac.zig b/lib/std/crypto/hmac.zig
index 12c4a53e0f36..5ff37f8112e9 100644
--- a/lib/std/crypto/hmac.zig
+++ b/lib/std/crypto/hmac.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/md5.zig b/lib/std/crypto/md5.zig
index ef9907d18b45..9306c222ed3d 100644
--- a/lib/std/crypto/md5.zig
+++ b/lib/std/crypto/md5.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const math = std.math;
diff --git a/lib/std/crypto/modes.zig b/lib/std/crypto/modes.zig
index 8848334dae7e..d2df2ce15a47 100644
--- a/lib/std/crypto/modes.zig
+++ b/lib/std/crypto/modes.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Based on Go stdlib implementation
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/pbkdf2.zig b/lib/std/crypto/pbkdf2.zig
index b3e2a32bf308..b8f03bceb717 100644
--- a/lib/std/crypto/pbkdf2.zig
+++ b/lib/std/crypto/pbkdf2.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const mem = std.mem;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/crypto/pcurves/p256.zig b/lib/std/crypto/pcurves/p256.zig
index dcc97bcbe5ed..02410a88590d 100644
--- a/lib/std/crypto/pcurves/p256.zig
+++ b/lib/std/crypto/pcurves/p256.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const builtin = std.builtin;
 const crypto = std.crypto;
diff --git a/lib/std/crypto/pcurves/p256/field.zig b/lib/std/crypto/pcurves/p256/field.zig
index 15de1fe43e21..c36db58e87de 100644
--- a/lib/std/crypto/pcurves/p256/field.zig
+++ b/lib/std/crypto/pcurves/p256/field.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const common = @import("../common.zig");
 
diff --git a/lib/std/crypto/pcurves/p256/scalar.zig b/lib/std/crypto/pcurves/p256/scalar.zig
index afdc3fb50201..265300a7a6bb 100644
--- a/lib/std/crypto/pcurves/p256/scalar.zig
+++ b/lib/std/crypto/pcurves/p256/scalar.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const builtin = std.builtin;
 const common = @import("../common.zig");
diff --git a/lib/std/crypto/pcurves/tests.zig b/lib/std/crypto/pcurves/tests.zig
index 6bd0ac43f2f1..0321d0574c4c 100644
--- a/lib/std/crypto/pcurves/tests.zig
+++ b/lib/std/crypto/pcurves/tests.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const fmt = std.fmt;
 const testing = std.testing;
diff --git a/lib/std/crypto/phc_encoding.zig b/lib/std/crypto/phc_encoding.zig
index 812c1d54ff01..56fa76b5c0f8 100644
--- a/lib/std/crypto/phc_encoding.zig
+++ b/lib/std/crypto/phc_encoding.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 // https://github.com/P-H-C/phc-string-format
 
 const std = @import("std");
diff --git a/lib/std/crypto/poly1305.zig b/lib/std/crypto/poly1305.zig
index e93afac859a6..4f16f66cd039 100644
--- a/lib/std/crypto/poly1305.zig
+++ b/lib/std/crypto/poly1305.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const utils = std.crypto.utils;
 const mem = std.mem;
diff --git a/lib/std/crypto/salsa20.zig b/lib/std/crypto/salsa20.zig
index 55e4db13f0c4..45dad75a8f39 100644
--- a/lib/std/crypto/salsa20.zig
+++ b/lib/std/crypto/salsa20.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/scrypt.zig b/lib/std/crypto/scrypt.zig
index 8d8e227408c7..5dcba41531d6 100644
--- a/lib/std/crypto/scrypt.zig
+++ b/lib/std/crypto/scrypt.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 // https://tools.ietf.org/html/rfc7914
 // https://github.com/golang/crypto/blob/master/scrypt/scrypt.go
 
diff --git a/lib/std/crypto/sha1.zig b/lib/std/crypto/sha1.zig
index e167a5071067..b464fb03f52a 100644
--- a/lib/std/crypto/sha1.zig
+++ b/lib/std/crypto/sha1.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const math = std.math;
diff --git a/lib/std/crypto/sha2.zig b/lib/std/crypto/sha2.zig
index eb0eccfa84c1..2d2a70c87f9b 100644
--- a/lib/std/crypto/sha2.zig
+++ b/lib/std/crypto/sha2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const math = std.math;
diff --git a/lib/std/crypto/sha3.zig b/lib/std/crypto/sha3.zig
index a4637c7fd4df..db8126d183d4 100644
--- a/lib/std/crypto/sha3.zig
+++ b/lib/std/crypto/sha3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const math = std.math;
diff --git a/lib/std/crypto/siphash.zig b/lib/std/crypto/siphash.zig
index 3bed5d1086e6..c984e04490a1 100644
--- a/lib/std/crypto/siphash.zig
+++ b/lib/std/crypto/siphash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // SipHash is a moderately fast pseudorandom function, returning a 64-bit or 128-bit tag for an arbitrary long input.
 //
diff --git a/lib/std/crypto/test.zig b/lib/std/crypto/test.zig
index b517fbecb16d..656fa89cfebe 100644
--- a/lib/std/crypto/test.zig
+++ b/lib/std/crypto/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const fmt = std.fmt;
diff --git a/lib/std/crypto/tlcsprng.zig b/lib/std/crypto/tlcsprng.zig
index 15a356d3d3bf..46960cc0907a 100644
--- a/lib/std/crypto/tlcsprng.zig
+++ b/lib/std/crypto/tlcsprng.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Thread-local cryptographically secure pseudo-random number generator.
 //! This file has public declarations that are intended to be used internally
 //! by the standard library; this namespace is not intended to be exposed
diff --git a/lib/std/cstr.zig b/lib/std/cstr.zig
index da7c646ddeec..6de5672df3ba 100644
--- a/lib/std/cstr.zig
+++ b/lib/std/cstr.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const debug = std.debug;
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index aa7a979f8ff8..13f8a4a83728 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/dwarf.zig b/lib/std/dwarf.zig
index eb22dba7c038..3a294c2dd362 100644
--- a/lib/std/dwarf.zig
+++ b/lib/std/dwarf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const debug = std.debug;
diff --git a/lib/std/dwarf_bits.zig b/lib/std/dwarf_bits.zig
index 99e268beb7fa..a40fa8a27773 100644
--- a/lib/std/dwarf_bits.zig
+++ b/lib/std/dwarf_bits.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const TAG_padding = 0x00;
 pub const TAG_array_type = 0x01;
 pub const TAG_class_type = 0x02;
diff --git a/lib/std/dynamic_library.zig b/lib/std/dynamic_library.zig
index d1750ef761a0..bd07003bad88 100644
--- a/lib/std/dynamic_library.zig
+++ b/lib/std/dynamic_library.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = std.builtin;
 
 const std = @import("std.zig");
diff --git a/lib/std/elf.zig b/lib/std/elf.zig
index 6c90dff92912..69f04868e8c3 100644
--- a/lib/std/elf.zig
+++ b/lib/std/elf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const io = std.io;
 const os = std.os;
diff --git a/lib/std/enums.zig b/lib/std/enums.zig
index 95c6fc7ec7ea..cfcc8e4f1d29 100644
--- a/lib/std/enums.zig
+++ b/lib/std/enums.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! This module contains utilities and data structures for working with enums.
 
 const std = @import("std.zig");
diff --git a/lib/std/event.zig b/lib/std/event.zig
index cd4af07d646d..6e608b54f04b 100644
--- a/lib/std/event.zig
+++ b/lib/std/event.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const Channel = @import("event/channel.zig").Channel;
 pub const Future = @import("event/future.zig").Future;
 pub const Group = @import("event/group.zig").Group;
diff --git a/lib/std/event/batch.zig b/lib/std/event/batch.zig
index af7f293cff77..4165f88f486c 100644
--- a/lib/std/event/batch.zig
+++ b/lib/std/event/batch.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 
diff --git a/lib/std/event/channel.zig b/lib/std/event/channel.zig
index 3880d6e286f9..915681d4a6d4 100644
--- a/lib/std/event/channel.zig
+++ b/lib/std/event/channel.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/event/future.zig b/lib/std/event/future.zig
index 81326f3fb687..17a7c3050b0a 100644
--- a/lib/std/event/future.zig
+++ b/lib/std/event/future.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/event/group.zig b/lib/std/event/group.zig
index 1d12689affa6..dc200017a476 100644
--- a/lib/std/event/group.zig
+++ b/lib/std/event/group.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const Lock = std.event.Lock;
diff --git a/lib/std/event/lock.zig b/lib/std/event/lock.zig
index c7aeff10662a..eea6a31455aa 100644
--- a/lib/std/event/lock.zig
+++ b/lib/std/event/lock.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/event/locked.zig b/lib/std/event/locked.zig
index c9303274a927..e921803447c4 100644
--- a/lib/std/event/locked.zig
+++ b/lib/std/event/locked.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const Lock = std.event.Lock;
 
diff --git a/lib/std/event/loop.zig b/lib/std/event/loop.zig
index 9c8550d459d1..50fb76ec9d11 100644
--- a/lib/std/event/loop.zig
+++ b/lib/std/event/loop.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const root = @import("root");
diff --git a/lib/std/event/rwlock.zig b/lib/std/event/rwlock.zig
index 3bd0c8603564..43d41b860e84 100644
--- a/lib/std/event/rwlock.zig
+++ b/lib/std/event/rwlock.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/event/rwlocked.zig b/lib/std/event/rwlocked.zig
index 0272ca39c7fa..9a569e8f1f97 100644
--- a/lib/std/event/rwlocked.zig
+++ b/lib/std/event/rwlocked.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const RwLock = std.event.RwLock;
 
diff --git a/lib/std/event/wait_group.zig b/lib/std/event/wait_group.zig
index dde01c61a3cf..2275a06d08bb 100644
--- a/lib/std/event/wait_group.zig
+++ b/lib/std/event/wait_group.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const Loop = std.event.Loop;
diff --git a/lib/std/fifo.zig b/lib/std/fifo.zig
index 8377fd13b562..93ef50b861a1 100644
--- a/lib/std/fifo.zig
+++ b/lib/std/fifo.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // FIFO of fixed size items
 // Usually used for e.g. byte buffers
 
diff --git a/lib/std/fmt.zig b/lib/std/fmt.zig
index a9895e270aab..dff9e893e3d3 100644
--- a/lib/std/fmt.zig
+++ b/lib/std/fmt.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const math = std.math;
 const assert = std.debug.assert;
diff --git a/lib/std/fmt/errol.zig b/lib/std/fmt/errol.zig
index a4f46e7f136a..e697b7d42fa2 100644
--- a/lib/std/fmt/errol.zig
+++ b/lib/std/fmt/errol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const enum3 = @import("errol/enum3.zig").enum3;
 const enum3_data = @import("errol/enum3.zig").enum3_data;
diff --git a/lib/std/fmt/errol/enum3.zig b/lib/std/fmt/errol/enum3.zig
index db671b8d254b..c27753483d16 100644
--- a/lib/std/fmt/errol/enum3.zig
+++ b/lib/std/fmt/errol/enum3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const enum3 = [_]u64{
     0x4e2e2785c3a2a20b,
     0x240a28877a09a4e1,
diff --git a/lib/std/fmt/errol/lookup.zig b/lib/std/fmt/errol/lookup.zig
index 4499d3fdefc8..2fb6b167bb49 100644
--- a/lib/std/fmt/errol/lookup.zig
+++ b/lib/std/fmt/errol/lookup.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const HP = struct {
     val: f64,
     off: f64,
diff --git a/lib/std/fmt/parse_float.zig b/lib/std/fmt/parse_float.zig
index ed6224b4b91c..585c23ed540c 100644
--- a/lib/std/fmt/parse_float.zig
+++ b/lib/std/fmt/parse_float.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Adapted from https://github.com/grzegorz-kraszewski/stringtofloat.
 
 // MIT License
diff --git a/lib/std/fmt/parse_hex_float.zig b/lib/std/fmt/parse_hex_float.zig
index 042da605499b..45a289fdd25b 100644
--- a/lib/std/fmt/parse_hex_float.zig
+++ b/lib/std/fmt/parse_hex_float.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.const std = @import("std");
-//
 // The rounding logic is inspired by LLVM's APFloat and Go's atofHex
 // implementation.
 
diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index cb33464dd219..1e02c0e805cd 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const root = @import("root");
 const builtin = std.builtin;
 const std = @import("std.zig");
diff --git a/lib/std/fs/file.zig b/lib/std/fs/file.zig
index 147ecc760861..1dd5e8ba9890 100644
--- a/lib/std/fs/file.zig
+++ b/lib/std/fs/file.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/fs/get_app_data_dir.zig b/lib/std/fs/get_app_data_dir.zig
index 41b8e7311d8e..fed1c85f3985 100644
--- a/lib/std/fs/get_app_data_dir.zig
+++ b/lib/std/fs/get_app_data_dir.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const unicode = std.unicode;
diff --git a/lib/std/fs/path.zig b/lib/std/fs/path.zig
index baaadcfe59dc..efc896e6b73e 100644
--- a/lib/std/fs/path.zig
+++ b/lib/std/fs/path.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 const debug = std.debug;
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index 26abbe5158f1..0ce416454ba5 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const builtin = std.builtin;
diff --git a/lib/std/fs/wasi.zig b/lib/std/fs/wasi.zig
index 2bfc384773ce..ad354e226f93 100644
--- a/lib/std/fs/wasi.zig
+++ b/lib/std/fs/wasi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const os = std.os;
 const mem = std.mem;
diff --git a/lib/std/fs/watch.zig b/lib/std/fs/watch.zig
index 40867bb3b570..7777793b29bd 100644
--- a/lib/std/fs/watch.zig
+++ b/lib/std/fs/watch.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const event = std.event;
diff --git a/lib/std/hash.zig b/lib/std/hash.zig
index f5b94725e2cf..f96d331d0fde 100644
--- a/lib/std/hash.zig
+++ b/lib/std/hash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const adler = @import("hash/adler.zig");
 pub const Adler32 = adler.Adler32;
 
diff --git a/lib/std/hash/adler.zig b/lib/std/hash/adler.zig
index 61408e82ee76..78f52b539b21 100644
--- a/lib/std/hash/adler.zig
+++ b/lib/std/hash/adler.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Adler32 checksum.
 //
 // https://tools.ietf.org/html/rfc1950#section-9
diff --git a/lib/std/hash/auto_hash.zig b/lib/std/hash/auto_hash.zig
index 3375066c1223..4f037349baaa 100644
--- a/lib/std/hash/auto_hash.zig
+++ b/lib/std/hash/auto_hash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/hash/benchmark.zig b/lib/std/hash/benchmark.zig
index 5a86afa0569c..b4952a926026 100644
--- a/lib/std/hash/benchmark.zig
+++ b/lib/std/hash/benchmark.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --zig-lib-dir ..
 
 const builtin = std.builtin;
diff --git a/lib/std/hash/cityhash.zig b/lib/std/hash/cityhash.zig
index 8796eb00757d..c6118c8cdcbc 100644
--- a/lib/std/hash/cityhash.zig
+++ b/lib/std/hash/cityhash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/hash/crc.zig b/lib/std/hash/crc.zig
index 597a0a4c7526..0b7a9a7c517c 100644
--- a/lib/std/hash/crc.zig
+++ b/lib/std/hash/crc.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // There are two implementations of CRC32 implemented with the following key characteristics:
 //
 // - Crc32WithPoly uses 8Kb of tables but is ~10x faster than the small method.
diff --git a/lib/std/hash/fnv.zig b/lib/std/hash/fnv.zig
index 7dadf5488ff0..3175f2682012 100644
--- a/lib/std/hash/fnv.zig
+++ b/lib/std/hash/fnv.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // FNV1a - Fowler-Noll-Vo hash function
 //
 // FNV1a is a fast, non-cryptographic hash function with fairly good distribution properties.
diff --git a/lib/std/hash/murmur.zig b/lib/std/hash/murmur.zig
index 2c6ec2bf1645..adb150446d3e 100644
--- a/lib/std/hash/murmur.zig
+++ b/lib/std/hash/murmur.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const testing = std.testing;
diff --git a/lib/std/hash/wyhash.zig b/lib/std/hash/wyhash.zig
index 83cd5e097c97..05340592a972 100644
--- a/lib/std/hash/wyhash.zig
+++ b/lib/std/hash/wyhash.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
index 77d2df2efe6f..5f5321dd560c 100644
--- a/lib/std/hash_map.zig
+++ b/lib/std/hash_map.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = debug.assert;
 const autoHash = std.hash.autoHash;
diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 088d6b39bbf7..9032225b394c 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const root = @import("root");
 const debug = std.debug;
diff --git a/lib/std/heap/arena_allocator.zig b/lib/std/heap/arena_allocator.zig
index 356d5c5d8155..d61f66ce4a50 100644
--- a/lib/std/heap/arena_allocator.zig
+++ b/lib/std/heap/arena_allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/heap/general_purpose_allocator.zig b/lib/std/heap/general_purpose_allocator.zig
index 006a41dae83e..d51c349be22d 100644
--- a/lib/std/heap/general_purpose_allocator.zig
+++ b/lib/std/heap/general_purpose_allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //! # General Purpose Allocator
 //!
 //! ## Design Priorities
diff --git a/lib/std/heap/log_to_writer_allocator.zig b/lib/std/heap/log_to_writer_allocator.zig
index c2fd687e0cc9..cf9c4162a742 100644
--- a/lib/std/heap/log_to_writer_allocator.zig
+++ b/lib/std/heap/log_to_writer_allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const Allocator = std.mem.Allocator;
 
diff --git a/lib/std/heap/logging_allocator.zig b/lib/std/heap/logging_allocator.zig
index 7baa857f00f6..5bd967b6965a 100644
--- a/lib/std/heap/logging_allocator.zig
+++ b/lib/std/heap/logging_allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const Allocator = std.mem.Allocator;
 
diff --git a/lib/std/io.zig b/lib/std/io.zig
index 8bb9c4d2c098..4127a7b08b09 100644
--- a/lib/std/io.zig
+++ b/lib/std/io.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const root = @import("root");
diff --git a/lib/std/io/bit_reader.zig b/lib/std/io/bit_reader.zig
index 9092c8a62d76..cb123bacbfc5 100644
--- a/lib/std/io/bit_reader.zig
+++ b/lib/std/io/bit_reader.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/bit_writer.zig b/lib/std/io/bit_writer.zig
index daa0718a18c4..5236e4965a08 100644
--- a/lib/std/io/bit_writer.zig
+++ b/lib/std/io/bit_writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/buffered_atomic_file.zig b/lib/std/io/buffered_atomic_file.zig
index 1aed190a47c5..5b27ba78f1a4 100644
--- a/lib/std/io/buffered_atomic_file.zig
+++ b/lib/std/io/buffered_atomic_file.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const fs = std.fs;
diff --git a/lib/std/io/buffered_reader.zig b/lib/std/io/buffered_reader.zig
index 16e6480037c0..b803e37602e6 100644
--- a/lib/std/io/buffered_reader.zig
+++ b/lib/std/io/buffered_reader.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/io/buffered_writer.zig b/lib/std/io/buffered_writer.zig
index 056ff08987f3..77f556f2d2f0 100644
--- a/lib/std/io/buffered_writer.zig
+++ b/lib/std/io/buffered_writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 
diff --git a/lib/std/io/c_writer.zig b/lib/std/io/c_writer.zig
index bbb7f1daf301..758df71165a2 100644
--- a/lib/std/io/c_writer.zig
+++ b/lib/std/io/c_writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/change_detection_stream.zig b/lib/std/io/change_detection_stream.zig
index 57ef8a82bd64..5ba2bb3c103b 100644
--- a/lib/std/io/change_detection_stream.zig
+++ b/lib/std/io/change_detection_stream.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/counting_reader.zig b/lib/std/io/counting_reader.zig
index 3b06555deb98..54e8e6f531a3 100644
--- a/lib/std/io/counting_reader.zig
+++ b/lib/std/io/counting_reader.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/counting_writer.zig b/lib/std/io/counting_writer.zig
index 28eddc1303b3..ee86c2a9b1e0 100644
--- a/lib/std/io/counting_writer.zig
+++ b/lib/std/io/counting_writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/find_byte_writer.zig b/lib/std/io/find_byte_writer.zig
index db45114d3e4e..cb7efac2d935 100644
--- a/lib/std/io/find_byte_writer.zig
+++ b/lib/std/io/find_byte_writer.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/io/fixed_buffer_stream.zig b/lib/std/io/fixed_buffer_stream.zig
index 8eb7c62a65f1..3623ef19896d 100644
--- a/lib/std/io/fixed_buffer_stream.zig
+++ b/lib/std/io/fixed_buffer_stream.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/limited_reader.zig b/lib/std/io/limited_reader.zig
index 1647d5aac3de..aa00af0d0925 100644
--- a/lib/std/io/limited_reader.zig
+++ b/lib/std/io/limited_reader.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/io/multi_writer.zig b/lib/std/io/multi_writer.zig
index 9676212bbd1b..ae683848d0de 100644
--- a/lib/std/io/multi_writer.zig
+++ b/lib/std/io/multi_writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/peek_stream.zig b/lib/std/io/peek_stream.zig
index f3b8ba66457b..c77052f97591 100644
--- a/lib/std/io/peek_stream.zig
+++ b/lib/std/io/peek_stream.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/reader.zig b/lib/std/io/reader.zig
index 0846b14650bd..3e8eb8ec24d3 100644
--- a/lib/std/io/reader.zig
+++ b/lib/std/io/reader.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/io/seekable_stream.zig b/lib/std/io/seekable_stream.zig
index 4ba39fff4281..1aa653dbe52c 100644
--- a/lib/std/io/seekable_stream.zig
+++ b/lib/std/io/seekable_stream.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 
 pub fn SeekableStream(
diff --git a/lib/std/io/stream_source.zig b/lib/std/io/stream_source.zig
index 1496c031bca7..06903b2977ed 100644
--- a/lib/std/io/stream_source.zig
+++ b/lib/std/io/stream_source.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 
diff --git a/lib/std/io/test.zig b/lib/std/io/test.zig
index c04da72230f5..f5cdbc279244 100644
--- a/lib/std/io/test.zig
+++ b/lib/std/io/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const io = std.io;
diff --git a/lib/std/io/writer.zig b/lib/std/io/writer.zig
index 6f9386b8de13..4f809dcca593 100644
--- a/lib/std/io/writer.zig
+++ b/lib/std/io/writer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const builtin = std.builtin;
diff --git a/lib/std/json.zig b/lib/std/json.zig
index 656c91c08021..ce9ed9af7db9 100644
--- a/lib/std/json.zig
+++ b/lib/std/json.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // JSON parser conforming to RFC8259.
 //
 // https://tools.ietf.org/html/rfc8259
diff --git a/lib/std/json/test.zig b/lib/std/json/test.zig
index 027f6acacaa4..c13d6b841706 100644
--- a/lib/std/json/test.zig
+++ b/lib/std/json/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // RFC 8529 conformance tests.
 //
 // Tests are taken from https://github.com/nst/JSONTestSuite
diff --git a/lib/std/json/write_stream.zig b/lib/std/json/write_stream.zig
index c9169be755e5..61da6ec49be0 100644
--- a/lib/std/json/write_stream.zig
+++ b/lib/std/json/write_stream.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/leb128.zig b/lib/std/leb128.zig
index 6535c867f89f..c908b56f694b 100644
--- a/lib/std/leb128.zig
+++ b/lib/std/leb128.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const testing = std.testing;
 
diff --git a/lib/std/linked_list.zig b/lib/std/linked_list.zig
index 7bab3e21886b..5039e16583ca 100644
--- a/lib/std/linked_list.zig
+++ b/lib/std/linked_list.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/log.zig b/lib/std/log.zig
index 1b3095e0ee16..02c209c68037 100644
--- a/lib/std/log.zig
+++ b/lib/std/log.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! std.log is a standardized interface for logging which allows for the logging
 //! of programs and libraries using this interface to be formatted and filtered
 //! by the implementer of the root.log function.
diff --git a/lib/std/macho.zig b/lib/std/macho.zig
index 14be755a7000..3c41b65522a8 100644
--- a/lib/std/macho.zig
+++ b/lib/std/macho.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const mach_header = extern struct {
     magic: u32,
     cputype: cpu_type_t,
diff --git a/lib/std/math.zig b/lib/std/math.zig
index 55ef506366c8..01cd68e0edf7 100644
--- a/lib/std/math.zig
+++ b/lib/std/math.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/math/acos.zig b/lib/std/math/acos.zig
index 5e3a289691f9..b90ba9c78ee6 100644
--- a/lib/std/math/acos.zig
+++ b/lib/std/math/acos.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/acosh.zig b/lib/std/math/acosh.zig
index 5e596a7bb077..e42f4fd5d3eb 100644
--- a/lib/std/math/acosh.zig
+++ b/lib/std/math/acosh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asin.zig b/lib/std/math/asin.zig
index 16560a12cd35..0849fac72e1e 100644
--- a/lib/std/math/asin.zig
+++ b/lib/std/math/asin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asinh.zig b/lib/std/math/asinh.zig
index 2855a73eb8da..71f7533b8924 100644
--- a/lib/std/math/asinh.zig
+++ b/lib/std/math/asinh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan.zig b/lib/std/math/atan.zig
index bbfaa22b1306..c67e6fe8e092 100644
--- a/lib/std/math/atan.zig
+++ b/lib/std/math/atan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan2.zig b/lib/std/math/atan2.zig
index 21f6b95b8b9b..d440d65e0458 100644
--- a/lib/std/math/atan2.zig
+++ b/lib/std/math/atan2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atanh.zig b/lib/std/math/atanh.zig
index 68824cea7a68..2c27234cd273 100644
--- a/lib/std/math/atanh.zig
+++ b/lib/std/math/atanh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/big.zig b/lib/std/math/big.zig
index 8ae214c666a6..8c0f7f5e1ed9 100644
--- a/lib/std/math/big.zig
+++ b/lib/std/math/big.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/math/big/int.zig b/lib/std/math/big/int.zig
index cbae123189c1..e289520e5790 100644
--- a/lib/std/math/big/int.zig
+++ b/lib/std/math/big/int.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const math = std.math;
 const Limb = std.math.big.Limb;
diff --git a/lib/std/math/big/int_test.zig b/lib/std/math/big/int_test.zig
index f4b294245aa7..757f994f7e4e 100644
--- a/lib/std/math/big/int_test.zig
+++ b/lib/std/math/big/int_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const mem = std.mem;
 const testing = std.testing;
diff --git a/lib/std/math/big/rational.zig b/lib/std/math/big/rational.zig
index 8b7c2d45d627..64f444eecafe 100644
--- a/lib/std/math/big/rational.zig
+++ b/lib/std/math/big/rational.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const debug = std.debug;
 const math = std.math;
diff --git a/lib/std/math/cbrt.zig b/lib/std/math/cbrt.zig
index 504657894d98..1ff1818e8def 100644
--- a/lib/std/math/cbrt.zig
+++ b/lib/std/math/cbrt.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ceil.zig b/lib/std/math/ceil.zig
index 77d3218c2409..fbac2561662d 100644
--- a/lib/std/math/ceil.zig
+++ b/lib/std/math/ceil.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex.zig b/lib/std/math/complex.zig
index 7d37fcca5ba2..3ae880f7c09a 100644
--- a/lib/std/math/complex.zig
+++ b/lib/std/math/complex.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/abs.zig b/lib/std/math/complex/abs.zig
index 6890d15f8ac1..87163605356d 100644
--- a/lib/std/math/complex/abs.zig
+++ b/lib/std/math/complex/abs.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acos.zig b/lib/std/math/complex/acos.zig
index 3d02ad63588b..12aec799e67d 100644
--- a/lib/std/math/complex/acos.zig
+++ b/lib/std/math/complex/acos.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acosh.zig b/lib/std/math/complex/acosh.zig
index c239936d47f9..6f20e4dda27f 100644
--- a/lib/std/math/complex/acosh.zig
+++ b/lib/std/math/complex/acosh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/arg.zig b/lib/std/math/complex/arg.zig
index 8a79daa07327..b2e960ae3e3a 100644
--- a/lib/std/math/complex/arg.zig
+++ b/lib/std/math/complex/arg.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asin.zig b/lib/std/math/complex/asin.zig
index f2c377df5686..e4b97c693dbe 100644
--- a/lib/std/math/complex/asin.zig
+++ b/lib/std/math/complex/asin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asinh.zig b/lib/std/math/complex/asinh.zig
index b1083c81bf98..bd1b8ee016b3 100644
--- a/lib/std/math/complex/asinh.zig
+++ b/lib/std/math/complex/asinh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/atan.zig b/lib/std/math/complex/atan.zig
index 4550edd9655c..484b41edf534 100644
--- a/lib/std/math/complex/atan.zig
+++ b/lib/std/math/complex/atan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/atanh.zig b/lib/std/math/complex/atanh.zig
index 41232570b5ef..01ddf7a9025d 100644
--- a/lib/std/math/complex/atanh.zig
+++ b/lib/std/math/complex/atanh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/conj.zig b/lib/std/math/complex/conj.zig
index ea4ba7356c09..7427e44caa38 100644
--- a/lib/std/math/complex/conj.zig
+++ b/lib/std/math/complex/conj.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cos.zig b/lib/std/math/complex/cos.zig
index 0760485bb05b..1c470c44c12c 100644
--- a/lib/std/math/complex/cos.zig
+++ b/lib/std/math/complex/cos.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cosh.zig b/lib/std/math/complex/cosh.zig
index 2a3673d4d10c..46f7a714a23a 100644
--- a/lib/std/math/complex/cosh.zig
+++ b/lib/std/math/complex/cosh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/exp.zig b/lib/std/math/complex/exp.zig
index 80fa837ab04e..f2ae28d3fd7a 100644
--- a/lib/std/math/complex/exp.zig
+++ b/lib/std/math/complex/exp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/ldexp.zig b/lib/std/math/complex/ldexp.zig
index c0a6c7a934a6..db710a043869 100644
--- a/lib/std/math/complex/ldexp.zig
+++ b/lib/std/math/complex/ldexp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/log.zig b/lib/std/math/complex/log.zig
index e59870d556be..90c51058cffe 100644
--- a/lib/std/math/complex/log.zig
+++ b/lib/std/math/complex/log.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/pow.zig b/lib/std/math/complex/pow.zig
index 092c8c2422c3..36c6796431d3 100644
--- a/lib/std/math/complex/pow.zig
+++ b/lib/std/math/complex/pow.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/proj.zig b/lib/std/math/complex/proj.zig
index 8527be2293fb..1e4b13f0df8a 100644
--- a/lib/std/math/complex/proj.zig
+++ b/lib/std/math/complex/proj.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sin.zig b/lib/std/math/complex/sin.zig
index 39b5f584ac84..7fa3fcf923f9 100644
--- a/lib/std/math/complex/sin.zig
+++ b/lib/std/math/complex/sin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sinh.zig b/lib/std/math/complex/sinh.zig
index 05d1d11bd2f4..ed344999ee16 100644
--- a/lib/std/math/complex/sinh.zig
+++ b/lib/std/math/complex/sinh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/sqrt.zig b/lib/std/math/complex/sqrt.zig
index 07fed152fab6..4f16e631b836 100644
--- a/lib/std/math/complex/sqrt.zig
+++ b/lib/std/math/complex/sqrt.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/tan.zig b/lib/std/math/complex/tan.zig
index 0ee34dfcc22b..9e1025f74f6b 100644
--- a/lib/std/math/complex/tan.zig
+++ b/lib/std/math/complex/tan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/tanh.zig b/lib/std/math/complex/tanh.zig
index 51dbc0fa90d2..0960c66679a8 100644
--- a/lib/std/math/complex/tanh.zig
+++ b/lib/std/math/complex/tanh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/copysign.zig b/lib/std/math/copysign.zig
index 47065fedaddd..72057c190dc8 100644
--- a/lib/std/math/copysign.zig
+++ b/lib/std/math/copysign.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/cos.zig b/lib/std/math/cos.zig
index 8033b46692ba..fad524fc88c4 100644
--- a/lib/std/math/cos.zig
+++ b/lib/std/math/cos.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/cosh.zig b/lib/std/math/cosh.zig
index f252aea805d4..c71e82ea1c71 100644
--- a/lib/std/math/cosh.zig
+++ b/lib/std/math/cosh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/epsilon.zig b/lib/std/math/epsilon.zig
index 61758f1ee035..de0297ee630b 100644
--- a/lib/std/math/epsilon.zig
+++ b/lib/std/math/epsilon.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const math = @import("../math.zig");
 
 /// Returns the machine epsilon for type T.
diff --git a/lib/std/math/exp.zig b/lib/std/math/exp.zig
index 43da387e46fd..384c4efab4bd 100644
--- a/lib/std/math/exp.zig
+++ b/lib/std/math/exp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/exp2.zig b/lib/std/math/exp2.zig
index e01c997dd765..502a305854ab 100644
--- a/lib/std/math/exp2.zig
+++ b/lib/std/math/exp2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expm1.zig b/lib/std/math/expm1.zig
index ebc76165bac9..5911edf36f98 100644
--- a/lib/std/math/expm1.zig
+++ b/lib/std/math/expm1.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expo2.zig b/lib/std/math/expo2.zig
index b88d4c2236a5..f404570fb692 100644
--- a/lib/std/math/expo2.zig
+++ b/lib/std/math/expo2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fabs.zig b/lib/std/math/fabs.zig
index 0b3c800b1238..1221db239032 100644
--- a/lib/std/math/fabs.zig
+++ b/lib/std/math/fabs.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/floor.zig b/lib/std/math/floor.zig
index e4855bc0715f..c5ddb9e1441c 100644
--- a/lib/std/math/floor.zig
+++ b/lib/std/math/floor.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fma.zig b/lib/std/math/fma.zig
index 0bc3271e36c3..ea6e15538f45 100644
--- a/lib/std/math/fma.zig
+++ b/lib/std/math/fma.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/frexp.zig b/lib/std/math/frexp.zig
index 4f3a03b0bc3a..f0d0c57af50a 100644
--- a/lib/std/math/frexp.zig
+++ b/lib/std/math/frexp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/hypot.zig b/lib/std/math/hypot.zig
index 4c2c6f1d8a0e..e47a1918928d 100644
--- a/lib/std/math/hypot.zig
+++ b/lib/std/math/hypot.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ilogb.zig b/lib/std/math/ilogb.zig
index deafeda7ce89..e8fc56d1f8eb 100644
--- a/lib/std/math/ilogb.zig
+++ b/lib/std/math/ilogb.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/inf.zig b/lib/std/math/inf.zig
index 5011193e9527..86ff2455332e 100644
--- a/lib/std/math/inf.zig
+++ b/lib/std/math/inf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 
diff --git a/lib/std/math/isfinite.zig b/lib/std/math/isfinite.zig
index 68aec258b0d0..762fb399910a 100644
--- a/lib/std/math/isfinite.zig
+++ b/lib/std/math/isfinite.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isinf.zig b/lib/std/math/isinf.zig
index 792e6b38f344..cadaa8d937c5 100644
--- a/lib/std/math/isinf.zig
+++ b/lib/std/math/isinf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnan.zig b/lib/std/math/isnan.zig
index cf598322e5cd..f28eb9ce8dbe 100644
--- a/lib/std/math/isnan.zig
+++ b/lib/std/math/isnan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnormal.zig b/lib/std/math/isnormal.zig
index f3942d121c0e..0430e1367a39 100644
--- a/lib/std/math/isnormal.zig
+++ b/lib/std/math/isnormal.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/ln.zig b/lib/std/math/ln.zig
index f85571fe3409..d2a5ae807ed4 100644
--- a/lib/std/math/ln.zig
+++ b/lib/std/math/ln.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log.zig b/lib/std/math/log.zig
index bf170aa95b69..cab652c62087 100644
--- a/lib/std/math/log.zig
+++ b/lib/std/math/log.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log10.zig b/lib/std/math/log10.zig
index 56e4afbab616..19602fb4a256 100644
--- a/lib/std/math/log10.zig
+++ b/lib/std/math/log10.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log1p.zig b/lib/std/math/log1p.zig
index f84433281833..e186b2795a4a 100644
--- a/lib/std/math/log1p.zig
+++ b/lib/std/math/log1p.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log2.zig b/lib/std/math/log2.zig
index 1a42404fea44..fca941c49a0e 100644
--- a/lib/std/math/log2.zig
+++ b/lib/std/math/log2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/modf.zig b/lib/std/math/modf.zig
index 2a8cf00bbb7c..d12c49772981 100644
--- a/lib/std/math/modf.zig
+++ b/lib/std/math/modf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/nan.zig b/lib/std/math/nan.zig
index 98051b155aef..5a01a5b3bdac 100644
--- a/lib/std/math/nan.zig
+++ b/lib/std/math/nan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const math = @import("../math.zig");
 
 /// Returns the nan representation for type T.
diff --git a/lib/std/math/pow.zig b/lib/std/math/pow.zig
index 732d716dff5e..040abf9a4484 100644
--- a/lib/std/math/pow.zig
+++ b/lib/std/math/pow.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/powi.zig b/lib/std/math/powi.zig
index ff7f44f4835d..6c4b3a65f4e6 100644
--- a/lib/std/math/powi.zig
+++ b/lib/std/math/powi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Based on Rust, which is licensed under the MIT license.
 // https://github.com/rust-lang/rust/blob/360432f1e8794de58cd94f34c9c17ad65871e5b5/LICENSE-MIT
 //
diff --git a/lib/std/math/round.zig b/lib/std/math/round.zig
index 863752a3f59c..7e1ee1ebd1c3 100644
--- a/lib/std/math/round.zig
+++ b/lib/std/math/round.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/scalbn.zig b/lib/std/math/scalbn.zig
index bdf382a303f0..30494c820a71 100644
--- a/lib/std/math/scalbn.zig
+++ b/lib/std/math/scalbn.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/signbit.zig b/lib/std/math/signbit.zig
index a1f2f127d464..056add5ae6d8 100644
--- a/lib/std/math/signbit.zig
+++ b/lib/std/math/signbit.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/sin.zig b/lib/std/math/sin.zig
index 83cccfe8bffe..4754e9502b2a 100644
--- a/lib/std/math/sin.zig
+++ b/lib/std/math/sin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/sinh.zig b/lib/std/math/sinh.zig
index 5a38e83ba960..5ec47fa3b587 100644
--- a/lib/std/math/sinh.zig
+++ b/lib/std/math/sinh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/sqrt.zig b/lib/std/math/sqrt.zig
index 5cd224aaaad8..d54063dcf62b 100644
--- a/lib/std/math/sqrt.zig
+++ b/lib/std/math/sqrt.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/tan.zig b/lib/std/math/tan.zig
index 7fedf301c4f4..d2c5009fb67c 100644
--- a/lib/std/math/tan.zig
+++ b/lib/std/math/tan.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/tanh.zig b/lib/std/math/tanh.zig
index 8f269db021b3..dcde79a925a5 100644
--- a/lib/std/math/tanh.zig
+++ b/lib/std/math/tanh.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/trunc.zig b/lib/std/math/trunc.zig
index 0d83dc608d04..eab9a8b0c7cf 100644
--- a/lib/std/math/trunc.zig
+++ b/lib/std/math/trunc.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index a0e87f26a5dc..57d5a383119b 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index 1e13ed97b74d..9ea7aeb90e2a 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //! The standard memory allocation interface.
 
 const std = @import("../std.zig");
diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 03fb4f80f145..a1bfacf59700 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const debug = std.debug;
diff --git a/lib/std/meta/trailer_flags.zig b/lib/std/meta/trailer_flags.zig
index 595f6917d916..516a65cfac82 100644
--- a/lib/std/meta/trailer_flags.zig
+++ b/lib/std/meta/trailer_flags.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const meta = std.meta;
 const testing = std.testing;
diff --git a/lib/std/meta/trait.zig b/lib/std/meta/trait.zig
index 26330aebc476..d1590141a16f 100644
--- a/lib/std/meta/trait.zig
+++ b/lib/std/meta/trait.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const mem = std.mem;
diff --git a/lib/std/multi_array_list.zig b/lib/std/multi_array_list.zig
index 9707c0634aa9..693937b399b5 100644
--- a/lib/std/multi_array_list.zig
+++ b/lib/std/multi_array_list.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const meta = std.meta;
diff --git a/lib/std/net.zig b/lib/std/net.zig
index fea033dc9cfc..c7411d9ecc77 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/net/test.zig b/lib/std/net/test.zig
index 589efbf53e21..2e63fc9329c4 100644
--- a/lib/std/net/test.zig
+++ b/lib/std/net/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const net = std.net;
diff --git a/lib/std/once.zig b/lib/std/once.zig
index a557f4aac9c9..638d3b10661e 100644
--- a/lib/std/once.zig
+++ b/lib/std/once.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const testing = std.testing;
diff --git a/lib/std/os.zig b/lib/std/os.zig
index 7781233a490f..294784c2bdbb 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // This file contains thin wrappers around OS-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/bits.zig b/lib/std/os/bits.zig
index 5c396091825f..36eda7707f96 100644
--- a/lib/std/os/bits.zig
+++ b/lib/std/os/bits.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //! Platform-dependent types and values that are used along with OS-specific APIs.
 //! These are imported into `std.c`, `std.os`, and `std.os.linux`.
 //! Root source files can define `os.bits` and these will additionally be added
diff --git a/lib/std/os/bits/darwin.zig b/lib/std/os/bits/darwin.zig
index 35d507541e52..a0f5e5a400cf 100644
--- a/lib/std/os/bits/darwin.zig
+++ b/lib/std/os/bits/darwin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/dragonfly.zig b/lib/std/os/bits/dragonfly.zig
index cf647a843828..c13a3aea910e 100644
--- a/lib/std/os/bits/dragonfly.zig
+++ b/lib/std/os/bits/dragonfly.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/freebsd.zig b/lib/std/os/bits/freebsd.zig
index b60676e266d7..51b7ef9f4dd3 100644
--- a/lib/std/os/bits/freebsd.zig
+++ b/lib/std/os/bits/freebsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = @import("builtin");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/haiku.zig b/lib/std/os/bits/haiku.zig
index 8421c80a52b5..620bf2341404 100644
--- a/lib/std/os/bits/haiku.zig
+++ b/lib/std/os/bits/haiku.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/linux.zig b/lib/std/os/bits/linux.zig
index 1dbc552b3c58..653fb8f1e1b4 100644
--- a/lib/std/os/bits/linux.zig
+++ b/lib/std/os/bits/linux.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 const arch = @import("builtin").target.cpu.arch;
diff --git a/lib/std/os/bits/linux/arm-eabi.zig b/lib/std/os/bits/linux/arm-eabi.zig
index 335ea074ec2c..91ca2b32d2b4 100644
--- a/lib/std/os/bits/linux/arm-eabi.zig
+++ b/lib/std/os/bits/linux/arm-eabi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // arm-eabi-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
diff --git a/lib/std/os/bits/linux/arm64.zig b/lib/std/os/bits/linux/arm64.zig
index e0771e7f662e..67c77ce186cf 100644
--- a/lib/std/os/bits/linux/arm64.zig
+++ b/lib/std/os/bits/linux/arm64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // arm64-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/errno/generic.zig b/lib/std/os/bits/linux/errno/generic.zig
index 49b35f650117..730c71a5a2f3 100644
--- a/lib/std/os/bits/linux/errno/generic.zig
+++ b/lib/std/os/bits/linux/errno/generic.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 pub const E = enum(u16) {
     /// No error occurred.
     /// Same code used for `NSROK`.
diff --git a/lib/std/os/bits/linux/errno/mips.zig b/lib/std/os/bits/linux/errno/mips.zig
index 4f14db65ee40..39fb9f71eaec 100644
--- a/lib/std/os/bits/linux/errno/mips.zig
+++ b/lib/std/os/bits/linux/errno/mips.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! These are MIPS ABI compatible.
 pub const E = enum(i32) {
     /// No error occurred.
diff --git a/lib/std/os/bits/linux/errno/sparc.zig b/lib/std/os/bits/linux/errno/sparc.zig
index cc43ce1a94c9..c4ab65f34a5a 100644
--- a/lib/std/os/bits/linux/errno/sparc.zig
+++ b/lib/std/os/bits/linux/errno/sparc.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! These match the SunOS error numbering scheme.
 pub const E = enum(i32) {
     /// No error occurred.
diff --git a/lib/std/os/bits/linux/i386.zig b/lib/std/os/bits/linux/i386.zig
index f8dadb8a6026..12c8fa471373 100644
--- a/lib/std/os/bits/linux/i386.zig
+++ b/lib/std/os/bits/linux/i386.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // i386-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/mips.zig b/lib/std/os/bits/linux/mips.zig
index e15875588955..ddf241fb4d38 100644
--- a/lib/std/os/bits/linux/mips.zig
+++ b/lib/std/os/bits/linux/mips.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/bits/linux/netlink.zig b/lib/std/os/bits/linux/netlink.zig
index a840a476257a..9de546fb208e 100644
--- a/lib/std/os/bits/linux/netlink.zig
+++ b/lib/std/os/bits/linux/netlink.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../linux.zig");
 
 /// Routing/device hook
diff --git a/lib/std/os/bits/linux/powerpc.zig b/lib/std/os/bits/linux/powerpc.zig
index 96908cb7141e..06f8e326ba2d 100644
--- a/lib/std/os/bits/linux/powerpc.zig
+++ b/lib/std/os/bits/linux/powerpc.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/bits/linux/powerpc64.zig b/lib/std/os/bits/linux/powerpc64.zig
index 52b9109247f1..74c6ad11fc7a 100644
--- a/lib/std/os/bits/linux/powerpc64.zig
+++ b/lib/std/os/bits/linux/powerpc64.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/bits/linux/prctl.zig b/lib/std/os/bits/linux/prctl.zig
index 249e60eca3f4..d29b6021b606 100644
--- a/lib/std/os/bits/linux/prctl.zig
+++ b/lib/std/os/bits/linux/prctl.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 pub const PR = enum(i32) {
     SET_PDEATHSIG = 1,
     GET_PDEATHSIG = 2,
diff --git a/lib/std/os/bits/linux/riscv64.zig b/lib/std/os/bits/linux/riscv64.zig
index 6147bca64f7b..7a0811cc1ab0 100644
--- a/lib/std/os/bits/linux/riscv64.zig
+++ b/lib/std/os/bits/linux/riscv64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // riscv64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const uid_t = std.os.linux.uid_t;
diff --git a/lib/std/os/bits/linux/securebits.zig b/lib/std/os/bits/linux/securebits.zig
index 374f7c9f02dc..a23ced3cf2ec 100644
--- a/lib/std/os/bits/linux/securebits.zig
+++ b/lib/std/os/bits/linux/securebits.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 fn issecure_mask(comptime x: comptime_int) comptime_int {
     return 1 << x;
 }
diff --git a/lib/std/os/bits/linux/x86_64.zig b/lib/std/os/bits/linux/x86_64.zig
index 30e5af384f9c..69beac9d878f 100644
--- a/lib/std/os/bits/linux/x86_64.zig
+++ b/lib/std/os/bits/linux/x86_64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // x86-64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const pid_t = linux.pid_t;
diff --git a/lib/std/os/bits/linux/xdp.zig b/lib/std/os/bits/linux/xdp.zig
index be615ecf98f3..88fa9918a356 100644
--- a/lib/std/os/bits/linux/xdp.zig
+++ b/lib/std/os/bits/linux/xdp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../linux.zig");
 
 pub const XDP_SHARED_UMEM = (1 << 0);
diff --git a/lib/std/os/bits/netbsd.zig b/lib/std/os/bits/netbsd.zig
index f1bfe1b958a8..be35889042c4 100644
--- a/lib/std/os/bits/netbsd.zig
+++ b/lib/std/os/bits/netbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = std.builtin;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/openbsd.zig b/lib/std/os/bits/openbsd.zig
index 5ad1f8980bf8..c7d1c0583bc6 100644
--- a/lib/std/os/bits/openbsd.zig
+++ b/lib/std/os/bits/openbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = std.builtin;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/posix.zig b/lib/std/os/bits/posix.zig
index 0f015cd57356..6ffd2dcf6a06 100644
--- a/lib/std/os/bits/posix.zig
+++ b/lib/std/os/bits/posix.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 pub const iovec = extern struct {
     iov_base: [*]u8,
     iov_len: usize,
diff --git a/lib/std/os/bits/wasi.zig b/lib/std/os/bits/wasi.zig
index eb68946f05d8..567d74961ef8 100644
--- a/lib/std/os/bits/wasi.zig
+++ b/lib/std/os/bits/wasi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Convenience types and consts used by std.os module
 const builtin = @import("builtin");
 const posix = @import("posix.zig");
diff --git a/lib/std/os/bits/windows.zig b/lib/std/os/bits/windows.zig
index 3943d1fd3d35..bb57a13ffebe 100644
--- a/lib/std/os/bits/windows.zig
+++ b/lib/std/os/bits/windows.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // The reference for these types and values is Microsoft Windows's ucrt (Universal C RunTime).
 
 usingnamespace @import("../windows/bits.zig");
diff --git a/lib/std/os/darwin.zig b/lib/std/os/darwin.zig
index 572b470239fe..5f9684b96de9 100644
--- a/lib/std/os/darwin.zig
+++ b/lib/std/os/darwin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/dragonfly.zig b/lib/std/os/dragonfly.zig
index 572b470239fe..5f9684b96de9 100644
--- a/lib/std/os/dragonfly.zig
+++ b/lib/std/os/dragonfly.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/freebsd.zig b/lib/std/os/freebsd.zig
index 572b470239fe..5f9684b96de9 100644
--- a/lib/std/os/freebsd.zig
+++ b/lib/std/os/freebsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/haiku.zig b/lib/std/os/haiku.zig
index a713a009ad7e..5f9684b96de9 100644
--- a/lib/std/os/haiku.zig
+++ b/lib/std/os/haiku.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 841f77467c74..369fae8f5325 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // This file provides the system interface functions for Linux matching those
 // that are provided by libc, whether or not libc is linked. The following
 // abstractions are made:
diff --git a/lib/std/os/linux/arm-eabi.zig b/lib/std/os/linux/arm-eabi.zig
index 469b7299d194..ded72fd100cf 100644
--- a/lib/std/os/linux/arm-eabi.zig
+++ b/lib/std/os/linux/arm-eabi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/arm64.zig b/lib/std/os/linux/arm64.zig
index 4c8306c048d9..92942a16cefe 100644
--- a/lib/std/os/linux/arm64.zig
+++ b/lib/std/os/linux/arm64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/bpf.zig b/lib/std/os/linux/bpf.zig
index 8afd85162941..cff4acaeee6a 100644
--- a/lib/std/os/linux/bpf.zig
+++ b/lib/std/os/linux/bpf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace std.os.linux;
 const std = @import("../../std.zig");
 const errno = getErrno;
diff --git a/lib/std/os/linux/bpf/btf.zig b/lib/std/os/linux/bpf/btf.zig
index d8a0cb57a908..35eaf1056106 100644
--- a/lib/std/os/linux/bpf/btf.zig
+++ b/lib/std/os/linux/bpf/btf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const magic = 0xeb9f;
 const version = 1;
 
diff --git a/lib/std/os/linux/bpf/btf_ext.zig b/lib/std/os/linux/bpf/btf_ext.zig
index ca713f1910b5..05d5d5705922 100644
--- a/lib/std/os/linux/bpf/btf_ext.zig
+++ b/lib/std/os/linux/bpf/btf_ext.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const Header = packed struct {
     magic: u16,
     version: u8,
diff --git a/lib/std/os/linux/bpf/helpers.zig b/lib/std/os/linux/bpf/helpers.zig
index 757c37949b8c..86c86c1ec5a6 100644
--- a/lib/std/os/linux/bpf/helpers.zig
+++ b/lib/std/os/linux/bpf/helpers.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const kern = @import("kern.zig");
 
 // in BPF, all the helper calls
diff --git a/lib/std/os/linux/bpf/kern.zig b/lib/std/os/linux/bpf/kern.zig
index 4d489eef5c4d..729495e91d18 100644
--- a/lib/std/os/linux/bpf/kern.zig
+++ b/lib/std/os/linux/bpf/kern.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../../std.zig");
 
 const in_bpf_program = switch (std.builtin.cpu.arch) {
diff --git a/lib/std/os/linux/i386.zig b/lib/std/os/linux/i386.zig
index 2ec34bac40f2..70178656d551 100644
--- a/lib/std/os/linux/i386.zig
+++ b/lib/std/os/linux/i386.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/io_uring.zig b/lib/std/os/linux/io_uring.zig
index 1db4c30d2a51..b74a7da3dd0d 100644
--- a/lib/std/os/linux/io_uring.zig
+++ b/lib/std/os/linux/io_uring.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const assert = std.debug.assert;
 const builtin = std.builtin;
diff --git a/lib/std/os/linux/mips.zig b/lib/std/os/linux/mips.zig
index 85157f04f865..5cff1e92657d 100644
--- a/lib/std/os/linux/mips.zig
+++ b/lib/std/os/linux/mips.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/powerpc.zig b/lib/std/os/linux/powerpc.zig
index 611eee1c5f0b..c48d86a155e9 100644
--- a/lib/std/os/linux/powerpc.zig
+++ b/lib/std/os/linux/powerpc.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/powerpc64.zig b/lib/std/os/linux/powerpc64.zig
index 611eee1c5f0b..c48d86a155e9 100644
--- a/lib/std/os/linux/powerpc64.zig
+++ b/lib/std/os/linux/powerpc64.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
index 3e2b15b599c0..dfc7e164e8c7 100644
--- a/lib/std/os/linux/riscv64.zig
+++ b/lib/std/os/linux/riscv64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index 8efa6c754f1b..e45c9dbb9937 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = std.builtin;
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/thumb.zig b/lib/std/os/linux/thumb.zig
index 85f8bfc52b41..d965e4430ef8 100644
--- a/lib/std/os/linux/thumb.zig
+++ b/lib/std/os/linux/thumb.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 // The syscall interface is identical to the ARM one but we're facing an extra
diff --git a/lib/std/os/linux/tls.zig b/lib/std/os/linux/tls.zig
index 5649cadd8b99..47230cf7869d 100644
--- a/lib/std/os/linux/tls.zig
+++ b/lib/std/os/linux/tls.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const os = std.os;
 const mem = std.mem;
diff --git a/lib/std/os/linux/vdso.zig b/lib/std/os/linux/vdso.zig
index f42bb064528b..f059ccad4ef5 100644
--- a/lib/std/os/linux/vdso.zig
+++ b/lib/std/os/linux/vdso.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const elf = std.elf;
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/x86_64.zig b/lib/std/os/linux/x86_64.zig
index 5aa32c56c302..c403742d3d26 100644
--- a/lib/std/os/linux/x86_64.zig
+++ b/lib/std/os/linux/x86_64.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("../bits/linux.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/netbsd.zig b/lib/std/os/netbsd.zig
index 572b470239fe..5f9684b96de9 100644
--- a/lib/std/os/netbsd.zig
+++ b/lib/std/os/netbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/openbsd.zig b/lib/std/os/openbsd.zig
index 572b470239fe..5f9684b96de9 100644
--- a/lib/std/os/openbsd.zig
+++ b/lib/std/os/openbsd.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/test.zig b/lib/std/os/test.zig
index fb23f4459aee..53a040294e9b 100644
--- a/lib/std/os/test.zig
+++ b/lib/std/os/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const os = std.os;
 const testing = std.testing;
diff --git a/lib/std/os/uefi.zig b/lib/std/os/uefi.zig
index 4bb8e375599e..b4582c121dc0 100644
--- a/lib/std/os/uefi.zig
+++ b/lib/std/os/uefi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 
 /// A protocol is an interface identified by a GUID.
diff --git a/lib/std/os/uefi/protocols.zig b/lib/std/os/uefi/protocols.zig
index 68dafdcecbb0..353c628a0582 100644
--- a/lib/std/os/uefi/protocols.zig
+++ b/lib/std/os/uefi/protocols.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const LoadedImageProtocol = @import("protocols/loaded_image_protocol.zig").LoadedImageProtocol;
 pub const loaded_image_device_path_protocol_guid = @import("protocols/loaded_image_protocol.zig").loaded_image_device_path_protocol_guid;
 
diff --git a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
index 3dfe97233194..ee795692338c 100644
--- a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/device_path_protocol.zig b/lib/std/os/uefi/protocols/device_path_protocol.zig
index d6b239fbbb88..df5949882207 100644
--- a/lib/std/os/uefi/protocols/device_path_protocol.zig
+++ b/lib/std/os/uefi/protocols/device_path_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_active_protocol.zig b/lib/std/os/uefi/protocols/edid_active_protocol.zig
index 750ff2833b17..fcdef78d83f7 100644
--- a/lib/std/os/uefi/protocols/edid_active_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_active_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
index fdbe59456337..00b59cb6c816 100644
--- a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_override_protocol.zig b/lib/std/os/uefi/protocols/edid_override_protocol.zig
index ad3a0939b552..8bf848c59abd 100644
--- a/lib/std/os/uefi/protocols/edid_override_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_override_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/file_protocol.zig b/lib/std/os/uefi/protocols/file_protocol.zig
index a1d001065c2a..1f80df0af2d1 100644
--- a/lib/std/os/uefi/protocols/file_protocol.zig
+++ b/lib/std/os/uefi/protocols/file_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Time = uefi.Time;
diff --git a/lib/std/os/uefi/protocols/graphics_output_protocol.zig b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
index 4cb7744e8a2c..a3bb50f0d214 100644
--- a/lib/std/os/uefi/protocols/graphics_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii.zig b/lib/std/os/uefi/protocols/hii.zig
index 9d85f293b38e..5e3c23d22ab8 100644
--- a/lib/std/os/uefi/protocols/hii.zig
+++ b/lib/std/os/uefi/protocols/hii.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/hii_database_protocol.zig b/lib/std/os/uefi/protocols/hii_database_protocol.zig
index 33014e1cb75d..e34f72c2f3b7 100644
--- a/lib/std/os/uefi/protocols/hii_database_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_database_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii_popup_protocol.zig b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
index ebbc1608b7bb..cf6bdf6da539 100644
--- a/lib/std/os/uefi/protocols/hii_popup_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/ip6_config_protocol.zig b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
index d6af0e5f39c0..aa9d783fd882 100644
--- a/lib/std/os/uefi/protocols/ip6_config_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_protocol.zig b/lib/std/os/uefi/protocols/ip6_protocol.zig
index fbca959656f5..dbe0f163968c 100644
--- a/lib/std/os/uefi/protocols/ip6_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
index 69a410c01ca1..97ab1a431c2e 100644
--- a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/loaded_image_protocol.zig b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
index a5c5610f9b81..b8afcb1063a1 100644
--- a/lib/std/os/uefi/protocols/loaded_image_protocol.zig
+++ b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/managed_network_protocol.zig b/lib/std/os/uefi/protocols/managed_network_protocol.zig
index 0da6d902f32c..122482be236d 100644
--- a/lib/std/os/uefi/protocols/managed_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
index f0b8c5fb152d..e9657e445640 100644
--- a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/rng_protocol.zig b/lib/std/os/uefi/protocols/rng_protocol.zig
index 25f7c936c317..a32b202f4428 100644
--- a/lib/std/os/uefi/protocols/rng_protocol.zig
+++ b/lib/std/os/uefi/protocols/rng_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
index 338d88fc9bf9..afbd26e9390a 100644
--- a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
+++ b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileHandle = uefi.FileHandle;
diff --git a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
index 68f08ebff868..119c1e658723 100644
--- a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileProtocol = uefi.protocols.FileProtocol;
diff --git a/lib/std/os/uefi/protocols/simple_network_protocol.zig b/lib/std/os/uefi/protocols/simple_network_protocol.zig
index 1cd93bc49178..a3743ac2c193 100644
--- a/lib/std/os/uefi/protocols/simple_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_network_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
index b76b5bc512a9..d217ab593027 100644
--- a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
index 0cc141664103..4a2b098e61a9 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
index 47e632021b54..8102ea99559d 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
index 6fb56724c714..84f540cb786a 100644
--- a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/udp6_protocol.zig b/lib/std/os/uefi/protocols/udp6_protocol.zig
index c2e42289987f..46c76beaa60e 100644
--- a/lib/std/os/uefi/protocols/udp6_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
index 620f015722b9..811692adc36d 100644
--- a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/status.zig b/lib/std/os/uefi/status.zig
index 48b8008b91b8..09bc5030eb71 100644
--- a/lib/std/os/uefi/status.zig
+++ b/lib/std/os/uefi/status.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const high_bit = 1 << @typeInfo(usize).Int.bits - 1;
 
 pub const Status = enum(usize) {
diff --git a/lib/std/os/uefi/tables.zig b/lib/std/os/uefi/tables.zig
index 649fe95cd25c..0011c80a9cd2 100644
--- a/lib/std/os/uefi/tables.zig
+++ b/lib/std/os/uefi/tables.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const AllocateType = @import("tables/boot_services.zig").AllocateType;
 pub const BootServices = @import("tables/boot_services.zig").BootServices;
 pub const ConfigurationTable = @import("tables/configuration_table.zig").ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/boot_services.zig b/lib/std/os/uefi/tables/boot_services.zig
index 8617642eaf5e..31ac352089f8 100644
--- a/lib/std/os/uefi/tables/boot_services.zig
+++ b/lib/std/os/uefi/tables/boot_services.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/tables/configuration_table.zig b/lib/std/os/uefi/tables/configuration_table.zig
index 00c8f2f42909..0ac3bd73c854 100644
--- a/lib/std/os/uefi/tables/configuration_table.zig
+++ b/lib/std/os/uefi/tables/configuration_table.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/tables/runtime_services.zig b/lib/std/os/uefi/tables/runtime_services.zig
index 2d1a1cdb8262..c3c59f957fb9 100644
--- a/lib/std/os/uefi/tables/runtime_services.zig
+++ b/lib/std/os/uefi/tables/runtime_services.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const TableHeader = uefi.tables.TableHeader;
diff --git a/lib/std/os/uefi/tables/system_table.zig b/lib/std/os/uefi/tables/system_table.zig
index c5b6c5f1e9f6..b52104f9c7d6 100644
--- a/lib/std/os/uefi/tables/system_table.zig
+++ b/lib/std/os/uefi/tables/system_table.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const BootServices = uefi.tables.BootServices;
 const ConfigurationTable = uefi.tables.ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/table_header.zig b/lib/std/os/uefi/tables/table_header.zig
index 8af1895cad8c..d5d40942327c 100644
--- a/lib/std/os/uefi/tables/table_header.zig
+++ b/lib/std/os/uefi/tables/table_header.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const TableHeader = extern struct {
     signature: u64,
     revision: u32,
diff --git a/lib/std/os/wasi.zig b/lib/std/os/wasi.zig
index e99d2b820b2c..708f445ee42b 100644
--- a/lib/std/os/wasi.zig
+++ b/lib/std/os/wasi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // wasi_snapshot_preview1 spec available (in witx format) here:
 // * typenames -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx
 // * module -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx
diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 04ce43375821..6972de597c2e 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // This file contains thin wrappers around Windows-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/windows/advapi32.zig b/lib/std/os/windows/advapi32.zig
index 6fa9ae2b4585..db77c4b7e976 100644
--- a/lib/std/os/windows/advapi32.zig
+++ b/lib/std/os/windows/advapi32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "advapi32" fn RegOpenKeyExW(
diff --git a/lib/std/os/windows/bits.zig b/lib/std/os/windows/bits.zig
index 59a2a8741567..7bc0e131ea12 100644
--- a/lib/std/os/windows/bits.zig
+++ b/lib/std/os/windows/bits.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Platform-dependent types and values that are used along with OS-specific APIs.
 
 const std = @import("../../std.zig");
diff --git a/lib/std/os/windows/gdi32.zig b/lib/std/os/windows/gdi32.zig
index c91e1d487cab..132fd80a34a8 100644
--- a/lib/std/os/windows/gdi32.zig
+++ b/lib/std/os/windows/gdi32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const PIXELFORMATDESCRIPTOR = extern struct {
diff --git a/lib/std/os/windows/kernel32.zig b/lib/std/os/windows/kernel32.zig
index a04314324d84..6996ad9991ac 100644
--- a/lib/std/os/windows/kernel32.zig
+++ b/lib/std/os/windows/kernel32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "kernel32" fn AddVectoredExceptionHandler(First: c_ulong, Handler: ?VECTORED_EXCEPTION_HANDLER) callconv(WINAPI) ?*c_void;
diff --git a/lib/std/os/windows/lang.zig b/lib/std/os/windows/lang.zig
index 40b363cfae0b..b173a62a73dc 100644
--- a/lib/std/os/windows/lang.zig
+++ b/lib/std/os/windows/lang.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const INVARIANT = 0x7f;
 pub const AFRIKAANS = 0x36;
diff --git a/lib/std/os/windows/ntdll.zig b/lib/std/os/windows/ntdll.zig
index ddc08e4bb22a..5a0154db6f8c 100644
--- a/lib/std/os/windows/ntdll.zig
+++ b/lib/std/os/windows/ntdll.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "NtDll" fn RtlGetVersion(
diff --git a/lib/std/os/windows/ntstatus.zig b/lib/std/os/windows/ntstatus.zig
index 11668a720626..41ba3ac81f26 100644
--- a/lib/std/os/windows/ntstatus.zig
+++ b/lib/std/os/windows/ntstatus.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 /// NTSTATUS codes from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/596a1078-e883-4972-9bbc-49e60bebca55?
 pub const NTSTATUS = enum(u32) {
     /// The caller specified WaitAny for WaitType and one of the dispatcher
diff --git a/lib/std/os/windows/ole32.zig b/lib/std/os/windows/ole32.zig
index bf1eabd63e75..e4e043265933 100644
--- a/lib/std/os/windows/ole32.zig
+++ b/lib/std/os/windows/ole32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "ole32" fn CoTaskMemFree(pv: LPVOID) callconv(WINAPI) void;
diff --git a/lib/std/os/windows/psapi.zig b/lib/std/os/windows/psapi.zig
index 2952df163562..cebe03d3aa1f 100644
--- a/lib/std/os/windows/psapi.zig
+++ b/lib/std/os/windows/psapi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "psapi" fn EmptyWorkingSet(hProcess: HANDLE) callconv(WINAPI) BOOL;
diff --git a/lib/std/os/windows/shell32.zig b/lib/std/os/windows/shell32.zig
index d184ba10362d..8739f9301e67 100644
--- a/lib/std/os/windows/shell32.zig
+++ b/lib/std/os/windows/shell32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "shell32" fn SHGetKnownFolderPath(rfid: *const KNOWNFOLDERID, dwFlags: DWORD, hToken: ?HANDLE, ppszPath: *[*:0]WCHAR) callconv(WINAPI) HRESULT;
diff --git a/lib/std/os/windows/sublang.zig b/lib/std/os/windows/sublang.zig
index ecc46dbfc4e5..e9929c6d79c2 100644
--- a/lib/std/os/windows/sublang.zig
+++ b/lib/std/os/windows/sublang.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const DEFAULT = 0x01;
 pub const SYS_DEFAULT = 0x02;
diff --git a/lib/std/os/windows/test.zig b/lib/std/os/windows/test.zig
index 8c18d413ca03..8e4d88615c9e 100644
--- a/lib/std/os/windows/test.zig
+++ b/lib/std/os/windows/test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = @import("builtin");
 const windows = std.os.windows;
diff --git a/lib/std/os/windows/user32.zig b/lib/std/os/windows/user32.zig
index d996a0f39459..e4511b62d3ab 100644
--- a/lib/std/os/windows/user32.zig
+++ b/lib/std/os/windows/user32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 const std = @import("std");
 const builtin = std.builtin;
diff --git a/lib/std/os/windows/win32error.zig b/lib/std/os/windows/win32error.zig
index b66d1734cbc6..008316ca1371 100644
--- a/lib/std/os/windows/win32error.zig
+++ b/lib/std/os/windows/win32error.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Codes are from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/18d8fbe8-a967-4f1c-ae50-99ca8e491d2d
 pub const Win32Error = enum(u16) {
     /// The operation completed successfully.
diff --git a/lib/std/os/windows/winmm.zig b/lib/std/os/windows/winmm.zig
index 69e4cef605e4..925905fb46a1 100644
--- a/lib/std/os/windows/winmm.zig
+++ b/lib/std/os/windows/winmm.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const MMRESULT = UINT;
diff --git a/lib/std/os/windows/ws2_32.zig b/lib/std/os/windows/ws2_32.zig
index 1aa6daa3e6c6..be5596691769 100644
--- a/lib/std/os/windows/ws2_32.zig
+++ b/lib/std/os/windows/ws2_32.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../../std.zig");
 usingnamespace @import("bits.zig");
 
diff --git a/lib/std/packed_int_array.zig b/lib/std/packed_int_array.zig
index 571aae6e4d01..e6ae58ff1866 100644
--- a/lib/std/packed_int_array.zig
+++ b/lib/std/packed_int_array.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/pdb.zig b/lib/std/pdb.zig
index 30b98941b066..698407a3a8f5 100644
--- a/lib/std/pdb.zig
+++ b/lib/std/pdb.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = std.builtin;
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/priority_dequeue.zig b/lib/std/priority_dequeue.zig
index 81329a0a74c9..d154f5df5e21 100644
--- a/lib/std/priority_dequeue.zig
+++ b/lib/std/priority_dequeue.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
diff --git a/lib/std/priority_queue.zig b/lib/std/priority_queue.zig
index de68442ea75f..228c07cadbb3 100644
--- a/lib/std/priority_queue.zig
+++ b/lib/std/priority_queue.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
diff --git a/lib/std/process.zig b/lib/std/process.zig
index db9f442e565c..f8b986d695f2 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/rand.zig b/lib/std/rand.zig
index 7d967d3715e5..104be7f692e4 100644
--- a/lib/std/rand.zig
+++ b/lib/std/rand.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! The engines provided here should be initialized from an external source.
 //! For a thread-local cryptographically secure pseudo random number generator,
 //! use `std.crypto.random`.
diff --git a/lib/std/rand/Gimli.zig b/lib/std/rand/Gimli.zig
index 8356c7afdee1..3f1488aa6243 100644
--- a/lib/std/rand/Gimli.zig
+++ b/lib/std/rand/Gimli.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! CSPRNG
 
 const std = @import("std");
diff --git a/lib/std/rand/Isaac64.zig b/lib/std/rand/Isaac64.zig
index ec505b0bf6d6..c3821d81aaec 100644
--- a/lib/std/rand/Isaac64.zig
+++ b/lib/std/rand/Isaac64.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! ISAAC64 - http://www.burtleburtle.net/bob/rand/isaacafa.html
 //!
 //! Follows the general idea of the implementation from here with a few shortcuts.
diff --git a/lib/std/rand/Pcg.zig b/lib/std/rand/Pcg.zig
index 8f468b5ea397..5c9789aa7bdf 100644
--- a/lib/std/rand/Pcg.zig
+++ b/lib/std/rand/Pcg.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! PCG32 - http://www.pcg-random.org/
 //!
 //! PRNG
diff --git a/lib/std/rand/Sfc64.zig b/lib/std/rand/Sfc64.zig
index 1966a59ceb4c..5808376e78f5 100644
--- a/lib/std/rand/Sfc64.zig
+++ b/lib/std/rand/Sfc64.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Sfc64 pseudo-random number generator from Practically Random.
 //! Fastest engine of pracrand and smallest footprint.
 //! See http://pracrand.sourceforge.net/
diff --git a/lib/std/rand/Xoroshiro128.zig b/lib/std/rand/Xoroshiro128.zig
index 4b507cec74cd..43dc95afb16a 100644
--- a/lib/std/rand/Xoroshiro128.zig
+++ b/lib/std/rand/Xoroshiro128.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Xoroshiro128+ - http://xoroshiro.di.unimi.it/
 //!
 //! PRNG
diff --git a/lib/std/rand/Xoshiro256.zig b/lib/std/rand/Xoshiro256.zig
index ead27b0fd175..c95cfc164de8 100644
--- a/lib/std/rand/Xoshiro256.zig
+++ b/lib/std/rand/Xoshiro256.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 //! Xoshiro256++ - http://xoroshiro.di.unimi.it/
 //!
 //! PRNG
diff --git a/lib/std/rand/ziggurat.zig b/lib/std/rand/ziggurat.zig
index c01f7c659a25..2b9728fa9685 100644
--- a/lib/std/rand/ziggurat.zig
+++ b/lib/std/rand/ziggurat.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Implements ZIGNOR [1].
 //
 // [1]: Jurgen A. Doornik (2005). [*An Improved Ziggurat Method to Generate Normal Random Samples*]
diff --git a/lib/std/sort.zig b/lib/std/sort.zig
index 67a4394b1ebb..cbc24d9abdc4 100644
--- a/lib/std/sort.zig
+++ b/lib/std/sort.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/special/build_runner.zig b/lib/std/special/build_runner.zig
index 2da273a6738d..9be6ffa671f3 100644
--- a/lib/std/special/build_runner.zig
+++ b/lib/std/special/build_runner.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const root = @import("@build");
 const std = @import("std");
 const builtin = @import("builtin");
diff --git a/lib/std/special/c.zig b/lib/std/special/c.zig
index a6de965f9047..d34e7a8a46a8 100644
--- a/lib/std/special/c.zig
+++ b/lib/std/special/c.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // This is Zig's multi-target implementation of libc.
 // When builtin.link_libc is true, we need to export all the functions and
 // provide an entire C API.
diff --git a/lib/std/special/compiler_rt.zig b/lib/std/special/compiler_rt.zig
index 69e099ae5717..27a2ba7a0466 100644
--- a/lib/std/special/compiler_rt.zig
+++ b/lib/std/special/compiler_rt.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/addXf3.zig b/lib/std/special/compiler_rt/addXf3.zig
index c5c739768040..59e9393ad6c7 100644
--- a/lib/std/special/compiler_rt/addXf3.zig
+++ b/lib/std/special/compiler_rt/addXf3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/lib/builtins/fp_add_impl.inc
diff --git a/lib/std/special/compiler_rt/addXf3_test.zig b/lib/std/special/compiler_rt/addXf3_test.zig
index 33051ed97007..70eb203ceee4 100644
--- a/lib/std/special/compiler_rt/addXf3_test.zig
+++ b/lib/std/special/compiler_rt/addXf3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/test/builtins/Unit/addtf3_test.c
diff --git a/lib/std/special/compiler_rt/arm.zig b/lib/std/special/compiler_rt/arm.zig
index f100f8293cd0..f30d2fd6ec54 100644
--- a/lib/std/special/compiler_rt/arm.zig
+++ b/lib/std/special/compiler_rt/arm.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // ARM specific builtins
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/ashldi3_test.zig b/lib/std/special/compiler_rt/ashldi3_test.zig
index 4b1eb1f9e4b7..b69b7a16ad27 100644
--- a/lib/std/special/compiler_rt/ashldi3_test.zig
+++ b/lib/std/special/compiler_rt/ashldi3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __ashldi3 = @import("shift.zig").__ashldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashlti3_test.zig b/lib/std/special/compiler_rt/ashlti3_test.zig
index 118712045713..5ab53c3b78c5 100644
--- a/lib/std/special/compiler_rt/ashlti3_test.zig
+++ b/lib/std/special/compiler_rt/ashlti3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __ashlti3 = @import("shift.zig").__ashlti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrdi3_test.zig b/lib/std/special/compiler_rt/ashrdi3_test.zig
index 423c22fc1270..c40b9bc054b4 100644
--- a/lib/std/special/compiler_rt/ashrdi3_test.zig
+++ b/lib/std/special/compiler_rt/ashrdi3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __ashrdi3 = @import("shift.zig").__ashrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrti3_test.zig b/lib/std/special/compiler_rt/ashrti3_test.zig
index e6d1d7ddbaac..d456897a27ba 100644
--- a/lib/std/special/compiler_rt/ashrti3_test.zig
+++ b/lib/std/special/compiler_rt/ashrti3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __ashrti3 = @import("shift.zig").__ashrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/atomics.zig b/lib/std/special/compiler_rt/atomics.zig
index 1b592da0196d..b6d0b55e33df 100644
--- a/lib/std/special/compiler_rt/atomics.zig
+++ b/lib/std/special/compiler_rt/atomics.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const arch = std.Target.current.cpu.arch;
diff --git a/lib/std/special/compiler_rt/aulldiv.zig b/lib/std/special/compiler_rt/aulldiv.zig
index 196c218e2429..7709e17e6336 100644
--- a/lib/std/special/compiler_rt/aulldiv.zig
+++ b/lib/std/special/compiler_rt/aulldiv.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _alldiv(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/aullrem.zig b/lib/std/special/compiler_rt/aullrem.zig
index 7d0eef592167..dbd52cd377ae 100644
--- a/lib/std/special/compiler_rt/aullrem.zig
+++ b/lib/std/special/compiler_rt/aullrem.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _allrem(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/clear_cache.zig b/lib/std/special/compiler_rt/clear_cache.zig
index 568373aabe11..033441acdbba 100644
--- a/lib/std/special/compiler_rt/clear_cache.zig
+++ b/lib/std/special/compiler_rt/clear_cache.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const arch = std.builtin.cpu.arch;
 const os = std.builtin.os.tag;
diff --git a/lib/std/special/compiler_rt/clzsi2.zig b/lib/std/special/compiler_rt/clzsi2.zig
index d7464d5ea997..29ef4bf85e27 100644
--- a/lib/std/special/compiler_rt/clzsi2.zig
+++ b/lib/std/special/compiler_rt/clzsi2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/special/compiler_rt/clzsi2_test.zig b/lib/std/special/compiler_rt/clzsi2_test.zig
index b7828cf63256..c8f6519b5bc9 100644
--- a/lib/std/special/compiler_rt/clzsi2_test.zig
+++ b/lib/std/special/compiler_rt/clzsi2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const clzsi2 = @import("clzsi2.zig");
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/compareXf2.zig b/lib/std/special/compiler_rt/compareXf2.zig
index 8a9dcf949232..fa7cdfe2a2f1 100644
--- a/lib/std/special/compiler_rt/compareXf2.zig
+++ b/lib/std/special/compiler_rt/compareXf2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/comparesf2.c
diff --git a/lib/std/special/compiler_rt/comparedf2_test.zig b/lib/std/special/compiler_rt/comparedf2_test.zig
index 018d95c0aed3..a80297ffbfb9 100644
--- a/lib/std/special/compiler_rt/comparedf2_test.zig
+++ b/lib/std/special/compiler_rt/comparedf2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparedf2_test.c
diff --git a/lib/std/special/compiler_rt/comparesf2_test.zig b/lib/std/special/compiler_rt/comparesf2_test.zig
index 10ffc3c06375..8bc2c679565f 100644
--- a/lib/std/special/compiler_rt/comparesf2_test.zig
+++ b/lib/std/special/compiler_rt/comparesf2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparesf2_test.c
diff --git a/lib/std/special/compiler_rt/divdf3.zig b/lib/std/special/compiler_rt/divdf3.zig
index 10a548090a2b..b39e428d9688 100644
--- a/lib/std/special/compiler_rt/divdf3.zig
+++ b/lib/std/special/compiler_rt/divdf3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divdf3.c
diff --git a/lib/std/special/compiler_rt/divdf3_test.zig b/lib/std/special/compiler_rt/divdf3_test.zig
index a472b5ed08a2..28cb0bc4dfa5 100644
--- a/lib/std/special/compiler_rt/divdf3_test.zig
+++ b/lib/std/special/compiler_rt/divdf3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divdf3_test.c
diff --git a/lib/std/special/compiler_rt/divsf3.zig b/lib/std/special/compiler_rt/divsf3.zig
index 3f89f123135f..b44f19506d35 100644
--- a/lib/std/special/compiler_rt/divsf3.zig
+++ b/lib/std/special/compiler_rt/divsf3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divsf3.c
diff --git a/lib/std/special/compiler_rt/divsf3_test.zig b/lib/std/special/compiler_rt/divsf3_test.zig
index 97f34d34a5f0..0c06d4c15a4e 100644
--- a/lib/std/special/compiler_rt/divsf3_test.zig
+++ b/lib/std/special/compiler_rt/divsf3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divsf3_test.c
diff --git a/lib/std/special/compiler_rt/divtf3.zig b/lib/std/special/compiler_rt/divtf3.zig
index d8ef463e4907..ea71c7502f91 100644
--- a/lib/std/special/compiler_rt/divtf3.zig
+++ b/lib/std/special/compiler_rt/divtf3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divtf3_test.zig b/lib/std/special/compiler_rt/divtf3_test.zig
index 3915177091fe..f426f827e8ce 100644
--- a/lib/std/special/compiler_rt/divtf3_test.zig
+++ b/lib/std/special/compiler_rt/divtf3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const math = std.math;
 const testing = std.testing;
diff --git a/lib/std/special/compiler_rt/divti3.zig b/lib/std/special/compiler_rt/divti3.zig
index 03bae3f3f836..1fb7947e6f61 100644
--- a/lib/std/special/compiler_rt/divti3.zig
+++ b/lib/std/special/compiler_rt/divti3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divti3_test.zig b/lib/std/special/compiler_rt/divti3_test.zig
index c4f7fd01b6a5..7992e4312fac 100644
--- a/lib/std/special/compiler_rt/divti3_test.zig
+++ b/lib/std/special/compiler_rt/divti3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __divti3 = @import("divti3.zig").__divti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/emutls.zig b/lib/std/special/compiler_rt/emutls.zig
index d51550c0d5f7..5d018d84ae54 100644
--- a/lib/std/special/compiler_rt/emutls.zig
+++ b/lib/std/special/compiler_rt/emutls.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2018 LLVM Compiler Infrastructure
-// Copyright (c) 2020 Sebastien Marie <semarie@online.fr>
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // __emutls_get_address specific builtin
 //
 // derived work from LLVM Compiler Infrastructure - release 8.0 (MIT)
diff --git a/lib/std/special/compiler_rt/extendXfYf2.zig b/lib/std/special/compiler_rt/extendXfYf2.zig
index 9a42a938b95b..1c95fd68c1c1 100644
--- a/lib/std/special/compiler_rt/extendXfYf2.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/extendXfYf2_test.zig b/lib/std/special/compiler_rt/extendXfYf2_test.zig
index 6a53dc5b44d2..89545576a206 100644
--- a/lib/std/special/compiler_rt/extendXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const __extendhfsf2 = @import("extendXfYf2.zig").__extendhfsf2;
 const __extendhftf2 = @import("extendXfYf2.zig").__extendhftf2;
diff --git a/lib/std/special/compiler_rt/fixdfdi.zig b/lib/std/special/compiler_rt/fixdfdi.zig
index f827f22a4a7f..11b50091294e 100644
--- a/lib/std/special/compiler_rt/fixdfdi.zig
+++ b/lib/std/special/compiler_rt/fixdfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfdi_test.zig b/lib/std/special/compiler_rt/fixdfdi_test.zig
index c8220b532d05..a9182cb7235d 100644
--- a/lib/std/special/compiler_rt/fixdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixdfdi = @import("fixdfdi.zig").__fixdfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfsi.zig b/lib/std/special/compiler_rt/fixdfsi.zig
index 2e9fab2297cc..8a6d8da34203 100644
--- a/lib/std/special/compiler_rt/fixdfsi.zig
+++ b/lib/std/special/compiler_rt/fixdfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfsi_test.zig b/lib/std/special/compiler_rt/fixdfsi_test.zig
index c9ebcbeddc9a..b3f0953160d1 100644
--- a/lib/std/special/compiler_rt/fixdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixdfsi = @import("fixdfsi.zig").__fixdfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfti.zig b/lib/std/special/compiler_rt/fixdfti.zig
index 88072de0632e..0e21f0ba1921 100644
--- a/lib/std/special/compiler_rt/fixdfti.zig
+++ b/lib/std/special/compiler_rt/fixdfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfti_test.zig b/lib/std/special/compiler_rt/fixdfti_test.zig
index 76f08f985db7..a66dc0eeef3b 100644
--- a/lib/std/special/compiler_rt/fixdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixdfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixdfti = @import("fixdfti.zig").__fixdfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint.zig b/lib/std/special/compiler_rt/fixint.zig
index 2947154d2034..6ef647410580 100644
--- a/lib/std/special/compiler_rt/fixint.zig
+++ b/lib/std/special/compiler_rt/fixint.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint_test.zig b/lib/std/special/compiler_rt/fixint_test.zig
index 86bc32e6424a..e8249813d467 100644
--- a/lib/std/special/compiler_rt/fixint_test.zig
+++ b/lib/std/special/compiler_rt/fixint_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfdi.zig b/lib/std/special/compiler_rt/fixsfdi.zig
index 9563af1a56a9..d0d958cdd6b3 100644
--- a/lib/std/special/compiler_rt/fixsfdi.zig
+++ b/lib/std/special/compiler_rt/fixsfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfdi_test.zig b/lib/std/special/compiler_rt/fixsfdi_test.zig
index e18a15d9a363..d184f934edb7 100644
--- a/lib/std/special/compiler_rt/fixsfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixsfdi = @import("fixsfdi.zig").__fixsfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfsi.zig b/lib/std/special/compiler_rt/fixsfsi.zig
index f1a32d9f77a2..84395d0fa67a 100644
--- a/lib/std/special/compiler_rt/fixsfsi.zig
+++ b/lib/std/special/compiler_rt/fixsfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfsi_test.zig b/lib/std/special/compiler_rt/fixsfsi_test.zig
index 6bc451a69797..588a76c9d438 100644
--- a/lib/std/special/compiler_rt/fixsfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixsfsi = @import("fixsfsi.zig").__fixsfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfti.zig b/lib/std/special/compiler_rt/fixsfti.zig
index 75c0a2fe1d70..d7ce4b3a602d 100644
--- a/lib/std/special/compiler_rt/fixsfti.zig
+++ b/lib/std/special/compiler_rt/fixsfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfti_test.zig b/lib/std/special/compiler_rt/fixsfti_test.zig
index 792716d5d3c5..220984a37eb3 100644
--- a/lib/std/special/compiler_rt/fixsfti_test.zig
+++ b/lib/std/special/compiler_rt/fixsfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixsfti = @import("fixsfti.zig").__fixsfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfdi.zig b/lib/std/special/compiler_rt/fixtfdi.zig
index a9e37b777fed..0ef3aa225937 100644
--- a/lib/std/special/compiler_rt/fixtfdi.zig
+++ b/lib/std/special/compiler_rt/fixtfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfdi_test.zig b/lib/std/special/compiler_rt/fixtfdi_test.zig
index ef72e6527c87..663023a475d2 100644
--- a/lib/std/special/compiler_rt/fixtfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixtfdi = @import("fixtfdi.zig").__fixtfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfsi.zig b/lib/std/special/compiler_rt/fixtfsi.zig
index cd92a972c49a..15e89a11b0b0 100644
--- a/lib/std/special/compiler_rt/fixtfsi.zig
+++ b/lib/std/special/compiler_rt/fixtfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfsi_test.zig b/lib/std/special/compiler_rt/fixtfsi_test.zig
index 61a963b07dbe..2e2637f53b39 100644
--- a/lib/std/special/compiler_rt/fixtfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixtfsi = @import("fixtfsi.zig").__fixtfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfti.zig b/lib/std/special/compiler_rt/fixtfti.zig
index cfae7c249b10..733fa1eed1b0 100644
--- a/lib/std/special/compiler_rt/fixtfti.zig
+++ b/lib/std/special/compiler_rt/fixtfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfti_test.zig b/lib/std/special/compiler_rt/fixtfti_test.zig
index 23ec67a737e4..354e835f2758 100644
--- a/lib/std/special/compiler_rt/fixtfti_test.zig
+++ b/lib/std/special/compiler_rt/fixtfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixtfti = @import("fixtfti.zig").__fixtfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixuint.zig b/lib/std/special/compiler_rt/fixuint.zig
index 518b5de4e49f..c51b80fbdb0b 100644
--- a/lib/std/special/compiler_rt/fixuint.zig
+++ b/lib/std/special/compiler_rt/fixuint.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const Log2Int = @import("std").math.Log2Int;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi.zig b/lib/std/special/compiler_rt/fixunsdfdi.zig
index 24a88236e002..800c9b1148ad 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi_test.zig b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
index dcccb076d4a8..59591cf18196 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunsdfdi = @import("fixunsdfdi.zig").__fixunsdfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi.zig b/lib/std/special/compiler_rt/fixunsdfsi.zig
index 416ffc59af32..156c21a887b1 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi_test.zig b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
index 059eb208c7f6..b4b7ec8840f4 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunsdfsi = @import("fixunsdfsi.zig").__fixunsdfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti.zig b/lib/std/special/compiler_rt/fixunsdfti.zig
index 02836a6f75a6..3dcec6bf8987 100644
--- a/lib/std/special/compiler_rt/fixunsdfti.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti_test.zig b/lib/std/special/compiler_rt/fixunsdfti_test.zig
index 89098afb336e..d9e1424836b9 100644
--- a/lib/std/special/compiler_rt/fixunsdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunsdfti = @import("fixunsdfti.zig").__fixunsdfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi.zig b/lib/std/special/compiler_rt/fixunssfdi.zig
index 77077b4344dd..ec00a7ee35c5 100644
--- a/lib/std/special/compiler_rt/fixunssfdi.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi_test.zig b/lib/std/special/compiler_rt/fixunssfdi_test.zig
index 005e005a9b88..3c46511b6de4 100644
--- a/lib/std/special/compiler_rt/fixunssfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunssfdi = @import("fixunssfdi.zig").__fixunssfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi.zig b/lib/std/special/compiler_rt/fixunssfsi.zig
index 9c63424629ef..a4e5a323f592 100644
--- a/lib/std/special/compiler_rt/fixunssfsi.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi_test.zig b/lib/std/special/compiler_rt/fixunssfsi_test.zig
index 90cb2022309a..4bf90e4bff28 100644
--- a/lib/std/special/compiler_rt/fixunssfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunssfsi = @import("fixunssfsi.zig").__fixunssfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfti.zig b/lib/std/special/compiler_rt/fixunssfti.zig
index ab5b95ec7f18..dff9eb74980f 100644
--- a/lib/std/special/compiler_rt/fixunssfti.zig
+++ b/lib/std/special/compiler_rt/fixunssfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfti_test.zig b/lib/std/special/compiler_rt/fixunssfti_test.zig
index 6dabae8ba84f..3c1a314e91f5 100644
--- a/lib/std/special/compiler_rt/fixunssfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunssfti = @import("fixunssfti.zig").__fixunssfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi.zig b/lib/std/special/compiler_rt/fixunstfdi.zig
index 2053b948e039..907116c1650e 100644
--- a/lib/std/special/compiler_rt/fixunstfdi.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi_test.zig b/lib/std/special/compiler_rt/fixunstfdi_test.zig
index ca7a8c8c0dc0..aa746799b724 100644
--- a/lib/std/special/compiler_rt/fixunstfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunstfdi = @import("fixunstfdi.zig").__fixunstfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi.zig b/lib/std/special/compiler_rt/fixunstfsi.zig
index 3c317cd7fe02..c66a3f18b492 100644
--- a/lib/std/special/compiler_rt/fixunstfsi.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi_test.zig b/lib/std/special/compiler_rt/fixunstfsi_test.zig
index f445edb59cab..206161bef593 100644
--- a/lib/std/special/compiler_rt/fixunstfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunstfsi = @import("fixunstfsi.zig").__fixunstfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfti.zig b/lib/std/special/compiler_rt/fixunstfti.zig
index b089fedd3ff2..1867c69234ba 100644
--- a/lib/std/special/compiler_rt/fixunstfti.zig
+++ b/lib/std/special/compiler_rt/fixunstfti.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfti_test.zig b/lib/std/special/compiler_rt/fixunstfti_test.zig
index 94ec32302ae9..e35e2a65be89 100644
--- a/lib/std/special/compiler_rt/fixunstfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfti_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __fixunstfti = @import("fixunstfti.zig").__fixunstfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatXisf.zig b/lib/std/special/compiler_rt/floatXisf.zig
index 4ce97c98f69e..b02ff5f622e1 100644
--- a/lib/std/special/compiler_rt/floatXisf.zig
+++ b/lib/std/special/compiler_rt/floatXisf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatdidf.zig b/lib/std/special/compiler_rt/floatdidf.zig
index 2e07c91dd560..afe9e906fd81 100644
--- a/lib/std/special/compiler_rt/floatdidf.zig
+++ b/lib/std/special/compiler_rt/floatdidf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatdidf_test.zig b/lib/std/special/compiler_rt/floatdidf_test.zig
index d20e6b39aa34..6b01ac5f3f6d 100644
--- a/lib/std/special/compiler_rt/floatdidf_test.zig
+++ b/lib/std/special/compiler_rt/floatdidf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatdidf = @import("floatdidf.zig").__floatdidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatdisf_test.zig b/lib/std/special/compiler_rt/floatdisf_test.zig
index a90326e943a5..010c4faddd6b 100644
--- a/lib/std/special/compiler_rt/floatdisf_test.zig
+++ b/lib/std/special/compiler_rt/floatdisf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatdisf = @import("floatXisf.zig").__floatdisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatditf.zig b/lib/std/special/compiler_rt/floatditf.zig
index a06f66e71ea0..581a0e0532bc 100644
--- a/lib/std/special/compiler_rt/floatditf.zig
+++ b/lib/std/special/compiler_rt/floatditf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatditf_test.zig b/lib/std/special/compiler_rt/floatditf_test.zig
index bec8384dce1c..cf8a81c68cca 100644
--- a/lib/std/special/compiler_rt/floatditf_test.zig
+++ b/lib/std/special/compiler_rt/floatditf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatditf = @import("floatditf.zig").__floatditf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatsiXf.zig b/lib/std/special/compiler_rt/floatsiXf.zig
index 91e52ac50a83..23d5cb1e3c15 100644
--- a/lib/std/special/compiler_rt/floatsiXf.zig
+++ b/lib/std/special/compiler_rt/floatsiXf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floattidf.zig b/lib/std/special/compiler_rt/floattidf.zig
index 2fa5fee4005b..6b5013287b9e 100644
--- a/lib/std/special/compiler_rt/floattidf.zig
+++ b/lib/std/special/compiler_rt/floattidf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattidf_test.zig b/lib/std/special/compiler_rt/floattidf_test.zig
index 826b73f8a143..62b131744f30 100644
--- a/lib/std/special/compiler_rt/floattidf_test.zig
+++ b/lib/std/special/compiler_rt/floattidf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floattidf = @import("floattidf.zig").__floattidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattisf_test.zig b/lib/std/special/compiler_rt/floattisf_test.zig
index 28df0b54ea56..30b36c3f9f73 100644
--- a/lib/std/special/compiler_rt/floattisf_test.zig
+++ b/lib/std/special/compiler_rt/floattisf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floattisf = @import("floatXisf.zig").__floattisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattitf.zig b/lib/std/special/compiler_rt/floattitf.zig
index a577b6dc10de..90bc241306fe 100644
--- a/lib/std/special/compiler_rt/floattitf.zig
+++ b/lib/std/special/compiler_rt/floattitf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattitf_test.zig b/lib/std/special/compiler_rt/floattitf_test.zig
index cf0aa138a967..76dfc8fbfcb6 100644
--- a/lib/std/special/compiler_rt/floattitf_test.zig
+++ b/lib/std/special/compiler_rt/floattitf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floattitf = @import("floattitf.zig").__floattitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundidf.zig b/lib/std/special/compiler_rt/floatundidf.zig
index e079dabced8f..1efe55da4062 100644
--- a/lib/std/special/compiler_rt/floatundidf.zig
+++ b/lib/std/special/compiler_rt/floatundidf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatundidf_test.zig b/lib/std/special/compiler_rt/floatundidf_test.zig
index 309439632611..71bfdd308744 100644
--- a/lib/std/special/compiler_rt/floatundidf_test.zig
+++ b/lib/std/special/compiler_rt/floatundidf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatundidf = @import("floatundidf.zig").__floatundidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundisf.zig b/lib/std/special/compiler_rt/floatundisf.zig
index 23674168471e..aca30ee30992 100644
--- a/lib/std/special/compiler_rt/floatundisf.zig
+++ b/lib/std/special/compiler_rt/floatundisf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunditf.zig b/lib/std/special/compiler_rt/floatunditf.zig
index 59c433b372d1..dda5dd6ea523 100644
--- a/lib/std/special/compiler_rt/floatunditf.zig
+++ b/lib/std/special/compiler_rt/floatunditf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunditf_test.zig b/lib/std/special/compiler_rt/floatunditf_test.zig
index 20dca4df4e03..ae6834c08231 100644
--- a/lib/std/special/compiler_rt/floatunditf_test.zig
+++ b/lib/std/special/compiler_rt/floatunditf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatunditf = @import("floatunditf.zig").__floatunditf;
 
 fn test__floatunditf(a: u64, expected_hi: u64, expected_lo: u64) !void {
diff --git a/lib/std/special/compiler_rt/floatunsidf.zig b/lib/std/special/compiler_rt/floatunsidf.zig
index e3f54e804290..555d4f5657a3 100644
--- a/lib/std/special/compiler_rt/floatunsidf.zig
+++ b/lib/std/special/compiler_rt/floatunsidf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsisf.zig b/lib/std/special/compiler_rt/floatunsisf.zig
index 1ff11c6388e0..c8a654ff7a7d 100644
--- a/lib/std/special/compiler_rt/floatunsisf.zig
+++ b/lib/std/special/compiler_rt/floatunsisf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsitf.zig b/lib/std/special/compiler_rt/floatunsitf.zig
index 1220e31b8945..a430471f3a7a 100644
--- a/lib/std/special/compiler_rt/floatunsitf.zig
+++ b/lib/std/special/compiler_rt/floatunsitf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunsitf_test.zig b/lib/std/special/compiler_rt/floatunsitf_test.zig
index a6a446dd4f89..7ae7c4328123 100644
--- a/lib/std/special/compiler_rt/floatunsitf_test.zig
+++ b/lib/std/special/compiler_rt/floatunsitf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatunsitf = @import("floatunsitf.zig").__floatunsitf;
 
 fn test__floatunsitf(a: u32, expected_hi: u64, expected_lo: u64) !void {
diff --git a/lib/std/special/compiler_rt/floatuntidf.zig b/lib/std/special/compiler_rt/floatuntidf.zig
index 6e1fe3b117c9..5b5adc04910a 100644
--- a/lib/std/special/compiler_rt/floatuntidf.zig
+++ b/lib/std/special/compiler_rt/floatuntidf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntidf_test.zig b/lib/std/special/compiler_rt/floatuntidf_test.zig
index 735b5bcdbb56..5fc6a471507d 100644
--- a/lib/std/special/compiler_rt/floatuntidf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntidf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatuntidf = @import("floatuntidf.zig").__floatuntidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntisf.zig b/lib/std/special/compiler_rt/floatuntisf.zig
index dd173945bab4..33e6e41a84fc 100644
--- a/lib/std/special/compiler_rt/floatuntisf.zig
+++ b/lib/std/special/compiler_rt/floatuntisf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntisf_test.zig b/lib/std/special/compiler_rt/floatuntisf_test.zig
index 5657db1c8221..dd06b7e3d7a2 100644
--- a/lib/std/special/compiler_rt/floatuntisf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntisf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatuntisf = @import("floatuntisf.zig").__floatuntisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntitf.zig b/lib/std/special/compiler_rt/floatuntitf.zig
index 9759268b9321..0b96076206db 100644
--- a/lib/std/special/compiler_rt/floatuntitf.zig
+++ b/lib/std/special/compiler_rt/floatuntitf.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntitf_test.zig b/lib/std/special/compiler_rt/floatuntitf_test.zig
index 41057aa38c45..5afbf348c6e0 100644
--- a/lib/std/special/compiler_rt/floatuntitf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntitf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __floatuntitf = @import("floatuntitf.zig").__floatuntitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/int.zig b/lib/std/special/compiler_rt/int.zig
index 4533d10ab9ba..e4d9df7a22c1 100644
--- a/lib/std/special/compiler_rt/int.zig
+++ b/lib/std/special/compiler_rt/int.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Builtin functions that operate on integer types
 const builtin = @import("builtin");
 const testing = @import("std").testing;
diff --git a/lib/std/special/compiler_rt/lshrdi3_test.zig b/lib/std/special/compiler_rt/lshrdi3_test.zig
index 1e3270711e64..acae7a999a94 100644
--- a/lib/std/special/compiler_rt/lshrdi3_test.zig
+++ b/lib/std/special/compiler_rt/lshrdi3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __lshrdi3 = @import("shift.zig").__lshrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/lshrti3_test.zig b/lib/std/special/compiler_rt/lshrti3_test.zig
index 3cb134f777da..a7db70024e2e 100644
--- a/lib/std/special/compiler_rt/lshrti3_test.zig
+++ b/lib/std/special/compiler_rt/lshrti3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __lshrti3 = @import("shift.zig").__lshrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/modti3.zig b/lib/std/special/compiler_rt/modti3.zig
index 298a488dc221..915b2b95668c 100644
--- a/lib/std/special/compiler_rt/modti3.zig
+++ b/lib/std/special/compiler_rt/modti3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/modti3.c
diff --git a/lib/std/special/compiler_rt/modti3_test.zig b/lib/std/special/compiler_rt/modti3_test.zig
index e05394173009..c7cee57f8bea 100644
--- a/lib/std/special/compiler_rt/modti3_test.zig
+++ b/lib/std/special/compiler_rt/modti3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __modti3 = @import("modti3.zig").__modti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulXf3.zig b/lib/std/special/compiler_rt/mulXf3.zig
index 20828badd384..f050cb1711bb 100644
--- a/lib/std/special/compiler_rt/mulXf3.zig
+++ b/lib/std/special/compiler_rt/mulXf3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/fp_mul_impl.inc
diff --git a/lib/std/special/compiler_rt/mulXf3_test.zig b/lib/std/special/compiler_rt/mulXf3_test.zig
index 2de681b06766..396b69bcd0de 100644
--- a/lib/std/special/compiler_rt/mulXf3_test.zig
+++ b/lib/std/special/compiler_rt/mulXf3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/test/builtins/Unit/multf3_test.c
diff --git a/lib/std/special/compiler_rt/muldi3.zig b/lib/std/special/compiler_rt/muldi3.zig
index d367721cb261..359484da09aa 100644
--- a/lib/std/special/compiler_rt/muldi3.zig
+++ b/lib/std/special/compiler_rt/muldi3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const is_test = std.builtin.is_test;
 const native_endian = std.Target.current.cpu.arch.endian();
diff --git a/lib/std/special/compiler_rt/muldi3_test.zig b/lib/std/special/compiler_rt/muldi3_test.zig
index 914e42bd15d0..6e005d67c86b 100644
--- a/lib/std/special/compiler_rt/muldi3_test.zig
+++ b/lib/std/special/compiler_rt/muldi3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __muldi3 = @import("muldi3.zig").__muldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulodi4.zig b/lib/std/special/compiler_rt/mulodi4.zig
index ed90b4d38263..94ed6752cc08 100644
--- a/lib/std/special/compiler_rt/mulodi4.zig
+++ b/lib/std/special/compiler_rt/mulodi4.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/mulodi4_test.zig b/lib/std/special/compiler_rt/mulodi4_test.zig
index c865b7a0c523..b9fea2553f1d 100644
--- a/lib/std/special/compiler_rt/mulodi4_test.zig
+++ b/lib/std/special/compiler_rt/mulodi4_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __mulodi4 = @import("mulodi4.zig").__mulodi4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/muloti4.zig b/lib/std/special/compiler_rt/muloti4.zig
index 30054ac7513f..b36a32666a50 100644
--- a/lib/std/special/compiler_rt/muloti4.zig
+++ b/lib/std/special/compiler_rt/muloti4.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/muloti4_test.zig b/lib/std/special/compiler_rt/muloti4_test.zig
index 34c1d2daab42..08450797fad9 100644
--- a/lib/std/special/compiler_rt/muloti4_test.zig
+++ b/lib/std/special/compiler_rt/muloti4_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __muloti4 = @import("muloti4.zig").__muloti4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/multi3.zig b/lib/std/special/compiler_rt/multi3.zig
index e0e992835f81..47343613300e 100644
--- a/lib/std/special/compiler_rt/multi3.zig
+++ b/lib/std/special/compiler_rt/multi3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const compiler_rt = @import("../compiler_rt.zig");
 const std = @import("std");
 const is_test = std.builtin.is_test;
diff --git a/lib/std/special/compiler_rt/multi3_test.zig b/lib/std/special/compiler_rt/multi3_test.zig
index a9ac76009975..e9eafc05dead 100644
--- a/lib/std/special/compiler_rt/multi3_test.zig
+++ b/lib/std/special/compiler_rt/multi3_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __multi3 = @import("multi3.zig").__multi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/negXf2.zig b/lib/std/special/compiler_rt/negXf2.zig
index 8c7010cccb43..06528b75706d 100644
--- a/lib/std/special/compiler_rt/negXf2.zig
+++ b/lib/std/special/compiler_rt/negXf2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __negsf2(a: f32) callconv(.C) f32 {
diff --git a/lib/std/special/compiler_rt/popcountdi2.zig b/lib/std/special/compiler_rt/popcountdi2.zig
index 8495068339fe..b7e7220c7b8c 100644
--- a/lib/std/special/compiler_rt/popcountdi2.zig
+++ b/lib/std/special/compiler_rt/popcountdi2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/popcountdi2_test.zig b/lib/std/special/compiler_rt/popcountdi2_test.zig
index 056b9827efef..736d04dac145 100644
--- a/lib/std/special/compiler_rt/popcountdi2_test.zig
+++ b/lib/std/special/compiler_rt/popcountdi2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __popcountdi2 = @import("popcountdi2.zig").__popcountdi2;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/shift.zig b/lib/std/special/compiler_rt/shift.zig
index e1a1a0489340..28109ce9cd7b 100644
--- a/lib/std/special/compiler_rt/shift.zig
+++ b/lib/std/special/compiler_rt/shift.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const Log2Int = std.math.Log2Int;
 const native_endian = std.Target.current.cpu.arch.endian();
diff --git a/lib/std/special/compiler_rt/sparc.zig b/lib/std/special/compiler_rt/sparc.zig
index 12c9de888ab6..3f2cbd86b5a3 100644
--- a/lib/std/special/compiler_rt/sparc.zig
+++ b/lib/std/special/compiler_rt/sparc.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // SPARC uses a different naming scheme for its support routines so we map it here to the x86 name.
 
diff --git a/lib/std/special/compiler_rt/stack_probe.zig b/lib/std/special/compiler_rt/stack_probe.zig
index f35afc3a6aa9..78f8a2f8bfa7 100644
--- a/lib/std/special/compiler_rt/stack_probe.zig
+++ b/lib/std/special/compiler_rt/stack_probe.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const native_arch = @import("std").Target.current.cpu.arch;
 
 // Zig's own stack-probe routine (available only on x86 and x86_64)
diff --git a/lib/std/special/compiler_rt/truncXfYf2.zig b/lib/std/special/compiler_rt/truncXfYf2.zig
index 9f34812199f3..737d0e330f8c 100644
--- a/lib/std/special/compiler_rt/truncXfYf2.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __truncsfhf2(a: f32) callconv(.C) u16 {
diff --git a/lib/std/special/compiler_rt/truncXfYf2_test.zig b/lib/std/special/compiler_rt/truncXfYf2_test.zig
index 9e581fd636c5..23c83afd9fa7 100644
--- a/lib/std/special/compiler_rt/truncXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const __truncsfhf2 = @import("truncXfYf2.zig").__truncsfhf2;
 
 fn test__truncsfhf2(a: u32, expected: u16) !void {
diff --git a/lib/std/special/compiler_rt/udivmod.zig b/lib/std/special/compiler_rt/udivmod.zig
index badfd97ad8a3..3d9618f79794 100644
--- a/lib/std/special/compiler_rt/udivmod.zig
+++ b/lib/std/special/compiler_rt/udivmod.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const native_endian = @import("std").Target.current.cpu.arch.endian();
diff --git a/lib/std/special/compiler_rt/udivmoddi4_test.zig b/lib/std/special/compiler_rt/udivmoddi4_test.zig
index edc07bc1dbe6..2861d33b3c39 100644
--- a/lib/std/special/compiler_rt/udivmoddi4_test.zig
+++ b/lib/std/special/compiler_rt/udivmoddi4_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmoddi4 = @import("int.zig").__udivmoddi4;
diff --git a/lib/std/special/compiler_rt/udivmodti4.zig b/lib/std/special/compiler_rt/udivmodti4.zig
index 310f4dce42f0..cc1141dbbca1 100644
--- a/lib/std/special/compiler_rt/udivmodti4.zig
+++ b/lib/std/special/compiler_rt/udivmodti4.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/compiler_rt/udivmodti4_test.zig b/lib/std/special/compiler_rt/udivmodti4_test.zig
index 5d39470f53d0..cb05500bee95 100644
--- a/lib/std/special/compiler_rt/udivmodti4_test.zig
+++ b/lib/std/special/compiler_rt/udivmodti4_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmodti4 = @import("udivmodti4.zig").__udivmodti4;
diff --git a/lib/std/special/compiler_rt/udivti3.zig b/lib/std/special/compiler_rt/udivti3.zig
index 8d95624edcad..52afa0420f5d 100644
--- a/lib/std/special/compiler_rt/udivti3.zig
+++ b/lib/std/special/compiler_rt/udivti3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/umodti3.zig b/lib/std/special/compiler_rt/umodti3.zig
index 98160039a1c8..29eb572892b4 100644
--- a/lib/std/special/compiler_rt/umodti3.zig
+++ b/lib/std/special/compiler_rt/umodti3.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/ssp.zig b/lib/std/special/ssp.zig
index 6eda11b2e2fa..7bc5cef81396 100644
--- a/lib/std/special/ssp.zig
+++ b/lib/std/special/ssp.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //
 // Small Zig reimplementation of gcc's libssp.
 //
diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index f8411c036bdb..4ca627d133ec 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const io = std.io;
 const builtin = @import("builtin");
diff --git a/lib/std/start.zig b/lib/std/start.zig
index b8e26869f010..a3035231df90 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 // This file is included in the compilation unit when exporting an executable.
 
 const root = @import("root");
diff --git a/lib/std/start_windows_tls.zig b/lib/std/start_windows_tls.zig
index 354a10c2612c..4b6db8bb4810 100644
--- a/lib/std/start_windows_tls.zig
+++ b/lib/std/start_windows_tls.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/std.zig b/lib/std/std.zig
index d4545717742f..39991ce305b3 100644
--- a/lib/std/std.zig
+++ b/lib/std/std.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 pub const ArrayHashMap = array_hash_map.ArrayHashMap;
 pub const ArrayHashMapUnmanaged = array_hash_map.ArrayHashMapUnmanaged;
 pub const ArrayList = @import("array_list.zig").ArrayList;
diff --git a/lib/std/target.zig b/lib/std/target.zig
index 1b9f0084c83a..c94b7a438674 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 const builtin = std.builtin;
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index 3323ee239b71..ae3757b5138e 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 
 const math = std.math;
diff --git a/lib/std/testing/failing_allocator.zig b/lib/std/testing/failing_allocator.zig
index 570050762d43..d8b243d0fae5 100644
--- a/lib/std/testing/failing_allocator.zig
+++ b/lib/std/testing/failing_allocator.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/time.zig b/lib/std/time.zig
index a0430049cfae..23065307533f 100644
--- a/lib/std/time.zig
+++ b/lib/std/time.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/time/epoch.zig b/lib/std/time/epoch.zig
index 75bddc71c390..126c4fceb738 100644
--- a/lib/std/time/epoch.zig
+++ b/lib/std/time/epoch.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 //! Epoch reference times in terms of their difference from
 //! UTC 1970-01-01 in seconds.
 
diff --git a/lib/std/unicode.zig b/lib/std/unicode.zig
index eddc2cb7ec27..b93b5e361f9a 100644
--- a/lib/std/unicode.zig
+++ b/lib/std/unicode.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("./std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/unicode/throughput_test.zig b/lib/std/unicode/throughput_test.zig
index e49da8ceaf89..2117564961cb 100644
--- a/lib/std/unicode/throughput_test.zig
+++ b/lib/std/unicode/throughput_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const time = std.time;
diff --git a/lib/std/valgrind.zig b/lib/std/valgrind.zig
index d149e56f493e..b8ca05a4c727 100644
--- a/lib/std/valgrind.zig
+++ b/lib/std/valgrind.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const math = std.math;
diff --git a/lib/std/valgrind/callgrind.zig b/lib/std/valgrind/callgrind.zig
index d29e1903fb34..6c7dadf1e196 100644
--- a/lib/std/valgrind/callgrind.zig
+++ b/lib/std/valgrind/callgrind.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const valgrind = std.valgrind;
 
diff --git a/lib/std/valgrind/memcheck.zig b/lib/std/valgrind/memcheck.zig
index 41657c8a664b..489abac2f65d 100644
--- a/lib/std/valgrind/memcheck.zig
+++ b/lib/std/valgrind/memcheck.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const valgrind = std.valgrind;
diff --git a/lib/std/wasm.zig b/lib/std/wasm.zig
index aebbb3b163ef..b7923fd0151f 100644
--- a/lib/std/wasm.zig
+++ b/lib/std/wasm.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const testing = @import("std.zig").testing;
 
 // TODO: Add support for multi-byte ops (e.g. table operations)
diff --git a/lib/std/x.zig b/lib/std/x.zig
index 3ac8b10f4a04..be0ab25e7a67 100644
--- a/lib/std/x.zig
+++ b/lib/std/x.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std.zig");
 
 pub const os = struct {
diff --git a/lib/std/x/net/ip.zig b/lib/std/x/net/ip.zig
index 409a8ebadfc5..a3f5dfecf6ee 100644
--- a/lib/std/x/net/ip.zig
+++ b/lib/std/x/net/ip.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 
 const fmt = std.fmt;
diff --git a/lib/std/x/net/tcp.zig b/lib/std/x/net/tcp.zig
index 25efbae67310..5e02b68e9c92 100644
--- a/lib/std/x/net/tcp.zig
+++ b/lib/std/x/net/tcp.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 
 const io = std.io;
diff --git a/lib/std/x/os/net.zig b/lib/std/x/os/net.zig
index d94692693257..cca9bc0ffa66 100644
--- a/lib/std/x/os/net.zig
+++ b/lib/std/x/os/net.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 
 const os = std.os;
diff --git a/lib/std/x/os/socket.zig b/lib/std/x/os/socket.zig
index 9da74d5b0ea2..33fc4971d752 100644
--- a/lib/std/x/os/socket.zig
+++ b/lib/std/x/os/socket.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 const net = @import("net.zig");
 
diff --git a/lib/std/x/os/socket_posix.zig b/lib/std/x/os/socket_posix.zig
index 59e4b177f718..895d4c80017a 100644
--- a/lib/std/x/os/socket_posix.zig
+++ b/lib/std/x/os/socket_posix.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 
 const os = std.os;
diff --git a/lib/std/x/os/socket_windows.zig b/lib/std/x/os/socket_windows.zig
index c08931fedf01..bcc722fcfe9c 100644
--- a/lib/std/x/os/socket_windows.zig
+++ b/lib/std/x/os/socket_windows.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("../../std.zig");
 const net = @import("net.zig");
 
diff --git a/lib/std/zig.zig b/lib/std/zig.zig
index 303c930b9382..85ad4d2c81f3 100644
--- a/lib/std/zig.zig
+++ b/lib/std/zig.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std.zig");
 const tokenizer = @import("zig/tokenizer.zig");
 const fmt = @import("zig/fmt.zig");
diff --git a/lib/std/zig/ast.zig b/lib/std/zig/ast.zig
index 61969d96993f..ee2b0982a9fe 100644
--- a/lib/std/zig/ast.zig
+++ b/lib/std/zig/ast.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/zig/c_builtins.zig b/lib/std/zig/c_builtins.zig
index 479f7a3b0e4b..6d7dc52bb899 100644
--- a/lib/std/zig/c_builtins.zig
+++ b/lib/std/zig/c_builtins.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 
 pub inline fn __builtin_bswap16(val: u16) u16 {
diff --git a/lib/std/zig/c_translation.zig b/lib/std/zig/c_translation.zig
index 7b21fba93ab2..bb8a699f69ab 100644
--- a/lib/std/zig/c_translation.zig
+++ b/lib/std/zig/c_translation.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 const std = @import("std");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/zig/cross_target.zig b/lib/std/zig/cross_target.zig
index 4a8879db57a3..5243d0eb9db5 100644
--- a/lib/std/zig/cross_target.zig
+++ b/lib/std/zig/cross_target.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Target = std.Target;
diff --git a/lib/std/zig/parse.zig b/lib/std/zig/parse.zig
index 24c34a953631..922b1e9858c0 100644
--- a/lib/std/zig/parse.zig
+++ b/lib/std/zig/parse.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/zig/parser_test.zig b/lib/std/zig/parser_test.zig
index f67b0c617912..fed63ba21f1a 100644
--- a/lib/std/zig/parser_test.zig
+++ b/lib/std/zig/parser_test.zig
@@ -1,9 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
-
 test "zig fmt: preserves clobbers in inline asm with stray comma" {
     try testTransform(
         \\fn foo() void {
diff --git a/lib/std/zig/perf_test.zig b/lib/std/zig/perf_test.zig
index 49a19a067cb1..00292507994b 100644
--- a/lib/std/zig/perf_test.zig
+++ b/lib/std/zig/perf_test.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const warn = std.debug.warn;
diff --git a/lib/std/zig/render.zig b/lib/std/zig/render.zig
index df91da8a0304..20ec7d3bfa68 100644
--- a/lib/std/zig/render.zig
+++ b/lib/std/zig/render.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/zig/string_literal.zig b/lib/std/zig/string_literal.zig
index b1dc53c47f41..64242038d3be 100644
--- a/lib/std/zig/string_literal.zig
+++ b/lib/std/zig/string_literal.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/zig/system.zig b/lib/std/zig/system.zig
index c5c62911ccf8..a2a92b39df97 100644
--- a/lib/std/zig/system.zig
+++ b/lib/std/zig/system.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const elf = std.elf;
 const mem = std.mem;
diff --git a/lib/std/zig/system/darwin.zig b/lib/std/zig/system/darwin.zig
index 1e8d9e4b48ea..30496e7d26df 100644
--- a/lib/std/zig/system/darwin.zig
+++ b/lib/std/zig/system/darwin.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const Allocator = mem.Allocator;
diff --git a/lib/std/zig/system/darwin/macos.zig b/lib/std/zig/system/darwin/macos.zig
index c8f48800c548..509faaef290b 100644
--- a/lib/std/zig/system/darwin/macos.zig
+++ b/lib/std/zig/system/darwin/macos.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/zig/system/windows.zig b/lib/std/zig/system/windows.zig
index d32b28f60719..595dac627882 100644
--- a/lib/std/zig/system/windows.zig
+++ b/lib/std/zig/system/windows.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2020 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 
 pub const WindowsVersion = std.Target.Os.WindowsVersion;
diff --git a/lib/std/zig/system/x86.zig b/lib/std/zig/system/x86.zig
index 1d9a22d5d20a..06a11c81ae15 100644
--- a/lib/std/zig/system/x86.zig
+++ b/lib/std/zig/system/x86.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("std");
 const Target = std.Target;
 const CrossTarget = std.zig.CrossTarget;
diff --git a/lib/std/zig/tokenizer.zig b/lib/std/zig/tokenizer.zig
index 3008aecdc358..1db2967c52f8 100644
--- a/lib/std/zig/tokenizer.zig
+++ b/lib/std/zig/tokenizer.zig
@@ -1,8 +1,3 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2015-2021 Zig Contributors
-// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
-// The MIT license requires this copyright notice to be included in all copies
-// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/tools/update-license-headers.zig b/tools/update-license-headers.zig
new file mode 100644
index 000000000000..4cc60ca4ea8f
--- /dev/null
+++ b/tools/update-license-headers.zig
@@ -0,0 +1,47 @@
+const std = @import("std");
+
+/// This script replaces a matching license header from .zig source files in a directory tree
+/// with the `new_header` below.
+const new_header = "";
+
+pub fn main() !void {
+    var progress = std.Progress{};
+    const root_node = try progress.start("", 0);
+    defer root_node.end();
+
+    var arena_allocator = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    const arena = &arena_allocator.allocator;
+
+    const args = try std.process.argsAlloc(arena);
+    const path_to_walk = args[1];
+    const dir = try std.fs.cwd().openDir(path_to_walk, .{ .iterate = true });
+
+    var walker = try dir.walk(arena);
+    defer walker.deinit();
+
+    var buffer: [500]u8 = undefined;
+    const expected_header = buffer[0..try std.io.getStdIn().readAll(&buffer)];
+
+    while (try walker.next()) |entry| {
+        if (!std.mem.endsWith(u8, entry.basename, ".zig"))
+            continue;
+
+        var node = root_node.start(entry.basename, 0);
+        node.activate();
+        defer node.end();
+
+        const source = try dir.readFileAlloc(arena, entry.path, 20 * 1024 * 1024);
+        if (!std.mem.startsWith(u8, source, expected_header)) {
+            std.debug.print("no match: {s}\n", .{entry.path});
+            continue;
+        }
+
+        const truncated_source = source[expected_header.len..];
+
+        const new_source = try arena.alloc(u8, truncated_source.len + new_header.len);
+        std.mem.copy(u8, new_source, new_header);
+        std.mem.copy(u8, new_source[new_header.len..], truncated_source);
+
+        try dir.writeFile(entry.path, new_source);
+    }
+}