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Vanilla license => http://vanillaforums.org/docs/license
Why NOT gpl3? Tivo is available on gpl2 but "GPL v3" closed doors for tivo!
GPL2 vs GPL3 => See this table
So, why vanilla developers team hasn't upgrated the license to version 3.0?
Maybe related discussions: http://vanillaforums.org/discussions/tagged/license/p1