Update dataplane license for CNCF requirements (#79)

Changes the dataplane licensing from `GPLv2` to dual-licensed `GPLv2 +
BSD-2-Clause` as per CNCF requirements as outlined in #78.

Resolves #78

README.md

@@ -113,9 +113,10 @@ on [Kubernetes Slack][kslack] on the `#sig-network-gateway-api` channel.
 
 The Blixt control-plane components are licensed under [Apache License, Version
 2.0][apache2], which is everything _outside_ of the `dataplane/` directory. The
-data-plane components are licensed under the [General Public License, Version
-2.0 (only)][gplv2], which includes everything _inside_ the `dataplane/`
-directory.
+data-plane components are dual-licensed under the [General Public License,
+Version 2.0 (only)][gplv2] and the [2-Clause BSD License][bsd2c] (at your
+option) including everything _inside_ the `dataplane/` directory.
 
 [apache2]:https://github.com/Kong/blixt/blob/main/LICENSE
-[gplv2]:https://github.com/Kong/blixt/blob/main/dataplane/LICENSE
+[gplv2]:https://github.com/Kong/blixt/blob/main/dataplane/LICENSE.GPL-2.0
+[bsd2c]:https://github.com/Kong/blixt/blob/main/dataplane/LICENSE.BSD-2-Clause

dataplane/Dockerfile

@@ -25,12 +25,13 @@ RUN --mount=type=cache,target=/workspace/target/ \
 FROM alpine
 
 LABEL org.opencontainers.image.source=https://github.com/kong/blixt
-LABEL org.opencontainers.image.licenses=GPL-2.0-only
+LABEL org.opencontainers.image.licenses=GPL-2.0-only,BSD-2-Clause
 
 WORKDIR /opt/blixt/
 
 COPY --from=builder /workspace/dataplane /opt/blixt/dataplane
 
-COPY LICENSE /opt/blixt/LICENSE
+COPY LICENSE.GPL-2.0 /opt/blixt/LICENSE.GPL-2.0
+COPY LICENSE.BSD-2-Clause /opt/blixt/LICENSE.BSD-2-Clause
 
 ENTRYPOINT ["/opt/blixt/dataplane"]

dataplane/LICENSE.BSD-2-Clause

@@ -0,0 +1,23 @@
+Copyright Kong. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.