The GNU Free Documentation License (GFDL) is a free license originated by the Free Software Foundation which permits a work to be copied, modified, and redistributed.
It is almost identical in intent to the Creative Commons Attribution ShareAlike license, although the two licenses are not technically compatible.
Key principles of the GFDL:
- Requires attribution
- Derivative "descendents" of the work must also be covered by the GFDL. (Equivalent to the ShareAlike clause in Creative Commons license.)
- Requires a full copy of the license to be included with any copies or derivations. (This makes use on physical objects impractical - e.g. using a GDFL image on a coffee cup - and is one of the key difference with the Creative Commons Attribution ShareAlike license.)
Interwiki links
External links
- GNU Free Documentation License, current version, (HTML with links to other formats).
http://www.gnu.org/licenses/fdl.html