Doom Source GPL'ed

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The guys at Doomworld have word that the Doom source code now falls under the GNU General Public License, which means anyone can do anything to the code, even sell it, as long as the source code is freely available. Here's the word from John Carmack about Doom source ports:

Any DOOM based EXE would have to have the source available upon request. It doesn't necessarily have to be included, but you have to be able to get at it if you wish. This would prevent a gldoom episode.

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