Category:GFDL files

 ''These files are licensed under the GFDL. Permission is granted to copy, distribute and/or modify these files under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to Wikia disclaimers.

To add to this category, type GFDL on the image information page
 * See also The Skybrary:Copyrights