The GNU Free Documentation License (GFDL) is a license originated by the Free Software Foundation which permits a work to be copied, modified, and redistributed.
Derivative "descendents" of the work must also be covered by the GFDL.
External links
- GNU Free Documentation License. Version 1.2, November 2002 (plain text version).
http://www.gnu.org/licenses/fdl.txt
- GNU Free Documentation License in other formats and additional information.
http://www.gnu.org/copyleft/fdl.html
- GNU Free Documentation License. (article on Wikipedia).
http://en.wikipedia.org/wiki/GNU_Free_Documentation_License