Wikipedia:Licensing update

As per the licensing update vote result and subsequent (May 2009) Wikimedia Foundation Board resolution, any content on Wikimedia Foundation projects available under the GNU Free Documentation License 1.2 with the possibility of upgrading to a later version was made available additionally under Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA).

Specifically with regard to text, since this update, only dual-licensed content or CC-BY-SA-compatible content can be added to the projects, any GFDL-only submissions will no longer be accepted. In other words, CC-BY-SA is the primary Wikimedia license for text, and GFDL is retained as a secondary license.

As per the Board resolution, this licensing change began to be implemented on all projects on June 15, 2009. (Any content not updated by this date could still be updated on any date prior to August 1, 2009.)