by mlepage » Oct 3, 2003 @ 4:02pm
Quake 1 and 2 are GPL.
Like any GPL code, you can use them in commercial applications without paying. You just have to provide all your source code and otherwise follow the GPL license.
The art, music, and other assets are not GPL and remain the property of id Software.
id Software remains free to continue to license Quake 2 to other parties under other licenses than the GPL, which require payment and don't require source release.