its not the movie encoding type thats the monopoly, its the fact that microsoft ship media player integrated into windows so people never try alternative media players and all the software companies trying to sell better media players are basically screwed (Just like the internet browser wars some years back). Also microsoft made it purposefully hard for other companies to produce alternatives to microsoft programs, ie because someone has bought windows they are forced to use a whole range of other microsoft products because microsoft won't allow competition.
Just looking at a few of the earlier posts, I don't think microsoft have to reveal source code per se, its integration details, ie how software should interact with parts of windows. (I think!
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