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I'm sure Carmack says alot more about the patent issues and open sourcing the engine in the keynote. http://www.youtube.com/watch?v=4zgYG-_ha28

It is amazing how technical his talk is it`s really intressting if you have a progamming background.

And it just so different to any other keynote for a game i have ever seen.

edit: 5 mins to the end he talks about the doom3 opensource