GNU Free Documentation License

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The GNU Free Documentation License (GNU FDL, or more commonly GFDL) is a copyleft free content license that was previously frequently used on many wiki websites for licensing their contents therein. It was created by the Free Software Foundation (FSF), being designed especially for documentation of software. The GFDL is one of the oldest free content licenses. However, the specialisation on software documentation brings about some problems when the GFDL used for licensing other sorts of content; see article GFDL concerns for more information.

The most notable user of the GFDL: the Wikipedia project, and its sister projects of the Wikimedia Foundation (WMF), moved from licensing their contents under GFDL to a double licensing scheme, with the comparable Creative Commons Attribution-ShareAlike license (CC-BY-SA), when the GNU granted the one-time chance to migrate content from the GNU Free Documentation License to this Creative Commons license in 2009.

Here on WikiIndex, you can find wikis with contents under this license listed in the category: Wiki GNU Free Documentation License. Images uploaded here on WikiIndex which are subject to the GFDL will be tagged with template:GFDL. The full text of the license can be found at: WikiIndex:Text of the GNU Free Documentation License.

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