[theRealMe]

In almost any other scenario this would be evidence. But Fast Inverse Square Root isn’t some tightly held secret. That exact code, with those specific comments included, is found in the Wikipedia page for that algo:

https://en.m.wikipedia.org/wiki/Fast_inverse_square_root

[nextaccountic]

The usage in Wikipedia is probably fair use, but it's still copyrighted, even without being a secret

[marginalia_nu]

Yeah, it's still GPL though.

[theRealMe]

True.