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Legal status
From Quake Wiki
Quake Trademark
Quake is a registered trademark of id Software. All other trademarks are properties of their respective owners. Shambler, Fiend and other characters may also be property of id software.
Engine
The source code of the Quake engine has been released under the free and open-source GPL license. You can find it on GitHub or the id Software FTP server.
Media
Original models, maps, textures etc are property of id Software and not available under a free license. There exist a few full replacement projects with GPL license.
The Quake palette, though, has been permitted by John Carmack to be freely distributed (citation needed).
Compiler tools
A set of compilers tools has been released as GPL.
Legal Discussions
| Unspecified user added a To-Do; add here links to forums threads about the legal status of the quake stuff.. |