The engine (idTech4) is released under GPL. Thus, you can use it for commercial ... | Hacker News

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albertzeyer on June 9, 2012 | parent | context | favorite | on: Doom 3 Source code review

The engine (idTech4) is released under GPL. Thus, you can use it for commercial use without paying anything. I guess you can also still buy a non-GPLed version.

loboman on June 9, 2012 [–]

Derivative work that uses the engine must be GPL'd too. That is bad for commercial products that intend to be closed source; I guess those are the commercial products that buy the engine.

ArtB on June 9, 2012 | [–]

But that doesn't apply to the maps, sounds, and textures which are really the heart of the game.

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