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-rw-r--r--doc/development/licensing.md3
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diff --git a/doc/development/licensing.md b/doc/development/licensing.md
index 9a5811d8474..a75cdf22f40 100644
--- a/doc/development/licensing.md
+++ b/doc/development/licensing.md
@@ -65,6 +65,7 @@ Libraries with the following licenses are unacceptable for use:
- [GNU AGPLv3][AGPLv3]: AGPL-licensed libraries cannot be linked to from non-GPL projects.
- [Open Software License (OSL)][OSL]: is a copyleft license. In addition, the FSF [recommend against its use][OSL-GNU].
- [Facebook BSD + PATENTS][Facebook]: is a 3-clause BSD license with a patent grant that has been deemed [Category X][x-list] by the Apache foundation.
+- [WTFPL][WTFPL]: is a public domain dedication [rejected by the OSI (3.2)][WTFPL-OSI]. Also has a strong language which is not in accordance with our diversity policy.
## Requesting Approval for Licenses
@@ -108,3 +109,5 @@ Gems which are included only in the "development" or "test" groups by Bundler ar
[x-list]: https://www.apache.org/legal/resolved.html#category-x
[Acceptable-Licenses]: #acceptable-licenses
[Unacceptable-Licenses]: #unacceptable-licenses
+[WTFPL]: https://wtfpl.net
+[WTFPL-OSI]: https://opensource.org/minutes20090304