From 10c6b249bd4fcc0bb332f1df5ffe3ec504c0f5a8 Mon Sep 17 00:00:00 2001
From: Alya Abbott <alya@zulip.com>
Date: Thu, 23 Jun 2022 13:27:55 -0700
Subject: [PATCH] docs: Add contributor guide page on licensing.

Co-authored-by: Anders Kaseorg <anders@zulip.com>
---
 docs/contributing/index.md     |  1 +
 docs/contributing/licensing.md | 40 ++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 docs/contributing/licensing.md

diff --git a/docs/contributing/index.md b/docs/contributing/index.md
index d32c9b4c6b..f7c433015b 100644
--- a/docs/contributing/index.md
+++ b/docs/contributing/index.md
@@ -10,6 +10,7 @@ code-style
 code-reviewing
 zulipbot-usage
 accessibility
+licensing
 bug-reports
 ../code-of-conduct
 gsoc
diff --git a/docs/contributing/licensing.md b/docs/contributing/licensing.md
new file mode 100644
index 0000000000..403cd54ef1
--- /dev/null
+++ b/docs/contributing/licensing.md
@@ -0,0 +1,40 @@
+# Licensing
+
+Zulip is distributed under the [Apache 2.0
+license](https://github.com/zulip/zulip/blob/main/LICENSE). This means that all
+contributions to Zulip — code, images, sounds, etc. — must be compatible with
+this license.
+
+## Contributing your own work
+
+If the work you are contributing is 100% your own, Zulip doesn't require you to
+sign a copyright assignment or a contributor license agreement for your
+contribution. As noted [in the GitHub Terms of
+Service](https://docs.github.com/en/site-policy/github-terms/github-terms-of-service#6-contributions-under-repository-license):
+
+> “Whenever you add Content to a repository containing notice of a license, you
+> license that Content under the same terms, and you agree that you have the
+> right to license that Content under those terms... This is widely accepted as
+> the norm in the open-source community; ...”
+
+## Contributing someone else's work
+
+If any part of your contribution is from someone else (code snippets, images,
+sounds, or any other copyrightable work, modified or unmodified), you need to
+check whether it was distributed under an open-source license that is
+[compatible][wiki-compatibility] with the [Apache 2.0
+license](https://github.com/zulip/zulip/blob/main/LICENSE). If it was not, this
+work cannot be contributed to Zulip, with or without modification.
+
+[wiki-compatibility]: https://en.wikipedia.org/wiki/License_compatibility#Compatibility_of_FOSS_licenses
+
+If you have verified that the work is OK to use, you will need to provide
+appropriate attribution in the [`docs/THIRDPARTY`
+file](https://github.com/zulip/zulip/blob/main/docs/THIRDPARTY) as part of your
+PR. Please refer to the [`debian/copyright` file
+documentation](https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/)
+for a detailed description (including examples) of how to correctly describe the
+copyright and licensing information in your PR.
+
+If you are not sure about the licensing or attribution for your work, please
+include the full details of your open questions in the description for your PR.