GNU Free Documentation License

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The GNU Free Documentation License (GFDL, GNU FDL) is a copyleft free content license that is frequently used on wiki websites for licensing their contents therin. It was designed by the Free Software Foundation especially for documentation of software, and is one of the oldest free-content licenses. The specialisation on software documentation brings about some problems when used for other sorts of content; see article GFDL Concerns for more information.

The most notable user of the GFDL, the Wikipedia projects and its sister projects of the Wikimedia Foundation, moved from licensing their contents under GFDL to a double licensing scheme with the comparable Creative Commons Attribution-ShareAlike license, when the GFDL granted the one-time chance to migrate content 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 hosted on WikiIndex 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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