Dual-license PyO3 under Apache 2.0 or MIT

.github/pull_request_template.md

@@ -1,8 +1,6 @@
 Thank you for contributing to PyO3!
 
-By submitting these contributions you agree for them to be licensed under PyO3's [Apache-2.0 license](https://github.com/PyO3/pyo3#license).
-
-PyO3 is currently undergoing a relicensing process to match Rust's dual-license under `Apache-2.0` and `MIT` licenses. While that process is ongoing, if you are a first-time contributor please add your agreement as a comment in [#3108](https://github.com/PyO3/pyo3/pull/3108).
+By submitting these contributions you agree for them to be dual-licensed under PyO3's [MIT OR Apache-2.0 license](https://github.com/PyO3/pyo3#license).
 
 Please consider adding the following to your pull request:
  - an entry for this PR in newsfragments - see [https://pyo3.rs/main/contributing.html#documenting-changes]

CITATION.cff

@@ -7,4 +7,6 @@ type: software
 authors:
   - name: PyO3 Project and Contributors
     website: https://github.com/PyO3
-license: Apache-2.0
+license:
+  - Apache-2.0
+  - MIT

Cargo.toml

@@ -9,7 +9,7 @@ homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3"
 documentation = "https://docs.rs/crate/pyo3/"
 categories = ["api-bindings", "development-tools::ffi"]
-license = "Apache-2.0"
+license = "MIT OR Apache-2.0"
 exclude = ["/.gitignore", ".cargo/config", "/codecov.yml", "/Makefile", "/pyproject.toml", "/noxfile.py", "/.github", "/tests/test_compile_error.rs", "/tests/ui"]
 edition = "2021"
 rust-version = "1.56"

LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2023-present PyO3 Project and Contributors.  https://github.com/PyO3
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

@@ -248,8 +248,10 @@ If you don't have time to contribute yourself but still wish to support the proj
 
 ## License
 
-PyO3 is licensed under the [Apache-2.0 license](https://opensource.org/licenses/APACHE-2.0). (The PyO3 project is in the process of collecting permission from past contributors to additionally license under the [MIT license](https://opensource.org/license/mit/), see [#3108](https://github.com/PyO3/pyo3/pull/3108). Once complete, PyO3 will additionally be licensed under the MIT license, the same as the Rust language itself is both Apache and MIT licensed.)
+PyO3 is licensed under the [Apache-2.0 license](LICENSE-APACHE) or the [MIT license](LICENSE-MIT), at your option.
 
 Python is licensed under the [Python License](https://docs.python.org/3/license.html).
 
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in PyO3 by you, as defined in the Apache License, shall be dual-licensed as above, without any additional terms or conditions.
+
 <a href="https://www.netlify.com"> <img src="https://www.netlify.com/v3/img/components/netlify-color-accent.svg" alt="Deploys by Netlify" /> </a>

newsfragments/3108.changed.md

@@ -0,0 +1 @@
+Dual-license PyO3 under either the Apache 2.0 OR the MIT license. This makes the project GPLv2 compatible.

pyo3-build-config/Cargo.toml

@@ -7,7 +7,7 @@ keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
-license = "Apache-2.0"
+license = "MIT OR Apache-2.0"
 edition = "2021"
 
 [dependencies]

pyo3-ffi/Cargo.toml

@@ -7,7 +7,7 @@ keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
-license = "Apache-2.0"
+license = "MIT OR Apache-2.0"
 edition = "2021"
 links = "python"
 

pyo3-macros-backend/Cargo.toml

@@ -7,7 +7,7 @@ keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
-license = "Apache-2.0"
+license = "MIT OR Apache-2.0"
 edition = "2021"
 
 # Note: we use default-features = false for proc-macro related crates

pyo3-macros/Cargo.toml

@@ -7,7 +7,7 @@ keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
-license = "Apache-2.0"
+license = "MIT OR Apache-2.0"
 edition = "2021"
 
 [lib]