Almost all the content served by Wikipedia is under the Creative Commons Attribution-ShareAlike License, which respects all four freedoms we insist for functional works (an encyclopedia is functional). Most text is dual-licensed under the GNU Free Documentation License. Media (pictures, sounds, videos) licensing varies. It usually is free (as in free software), including public domain. The inclusion of media under the "fair use" is only accepted in language editions that relate to legislations where this concept exists. No "fair use" in the Japanese Wikipedia for example.

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