[polishTar]

Fast inverse square root is now part of the public domain.

Also, even if this weren’t the case you can’t sue for damages to other people (they’d need to bring their own suit)

[anonymoushn]

Is the particular implementation that the model spits out 70+ years old?

[immibis]

Has it really already been 70 years since John Carmack died?

[polishTar]

Ah, you're right. I was wrong to say "public domain".

It would be more correct to say Quake III Arena was released to the public as free software under the GPLv2 license.