Before I read about XVid format I think that XVid is just a reverse of Divx codec (it's mean that XVid just reverse 'some' algorithm used by Divx). But wikipedia now I know that XVid is an open source version of Divx codec (released under GNU Public License). It's mean that DivX codec is proprietary codec and Divx isn't just launching codec, but also a player.
Source : http://en.wikipedia.org/wiki/Xvid
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