Wikipedia Community Vote On License Migration
mlinksva writes "A Wikipedia community vote is now underway on migrating to Creative Commons Attribution-ShareAlike as the main content license for Wikimedia Foundation projects. This would remove a legal barrier to reusing Wikipedia content (now under the Free Documentation License, intended for narrow use with software documentation, because Wikipedia started before CC existed) in other free culture projects and vice versa."
Existing content contributed to Wikipedia was done under the GFDL license, which like the standard GPLv2 includes a "or later version" clause. Wikipedia's license includes this clause.
The latest version of the GFDL now contains a section I think written to specifically allow Wikimedia to do this. See section 11, "Relicensing" here:
http://www.gnu.org/copyleft/fdl.html
"I want to get more into theory, because everything works in theory." -John Cash
The CCSA is backwards compatible with the GFDL.
That clause seems to be written specially for Wikipedia:
Neat legal hack...
# cat
Damn, my RAM is full of llamas.
Mod parent up. That's the basic idea: GFDL was never really designed for something like Wikipedia, and CC-BY-SA accomplishes the same thing much more elegantly while preserving the intent of the GFDL.
One other issue is ease of compliance. The CC-BY-SA license only requires attribution "reasonable to the medium", including the author(s), title, and URI where applicable. The GFDL has the additional requirement that the entire text of the GFDL be included with every copy of any part of the work. This makes technical compliance much more difficult, and thus conflicts with Wikipedia's goal of widespread distribution in many mediums.
Not everything will be dual licensed. In particular, this allows Wikipedia to incorporate a large amount of media (images, sound, and video) that are CC-BY-SA licensed but aren't GFDL licensed. It also allows other projects that use CC-BY-SA (like other Wikis) to incorporate Wikipedia material without having to comply with the GFDL.