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===Free content===
The [[GFDL]], the license through which Wikipedia's articles are made available, is one of many "[[copyleft]]" [[copyright]] licenses that permit the redistribution, creation of [[derivative work]]s, and commercial use of content, provided that its authors are attributed and this content remains available under the GFDL. When an author contributes original material to the project, the copyright over it is retained by them, but they agree to make the work available under the GFDL. Material on Wikipedia may thus be distributed multilingually to, or incorporated from resources which also use this license.
Wikipedia's content has been reflected and forked by hundreds of resources from database dumps. Although all text is available under the GFDL, a significant percentage of Wikipedia's images and sounds are not free. Items such as [[corporate logo]]s, song samples, or copyrighted news photos are used with a claim of [[fair use]].<ref>"[http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_as_a_press_source_2005 Wikipedia as a press source (2005)]", Wikipedia ([[March 28]], [[2005]])</ref> Wikipedia content has also been used in academic studies, books and conferences, albeit much more rarely. Wikipedia was once used in a United States court case,<ref>[http://www.ca11.uscourts.gov/opinions/ops/200216886.pdf Bourgeois ''et al'' v. Peters ''et al.'']</ref> and the [[Parliament of Canada]] website refers to Wikipedia's article on [[same-sex marriage]] in the "further reading" list of [[Civil Marriage Act]].<ref>"[http://www.parl.gc.ca/LEGISINFO/index.asp?Lang=E&Chamber=C&StartList=2&EndList=200&Session=13&Type=0&Scope=I&query=4381&List=toc C-38]", LEGISINFO ([[March 28]], [[2005]])</ref> Some Wikipedia users, or ''Wikipedians'', maintain (noncomprehensive) lists of such uses.<ref>[http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_as_a_source Wikipedia as a source]</ref>
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