I believe this game had some interesting anti cheat, it would still let you play if it knew it was cracked but would just make your aim worse and worse until you gave up.
One thing is 120bit RSA (readily broken with a graphing calculator at the time of release), another thing is the provenance of the RSA implementation code in the original binary.
It was called FADE <https://kotaku.com/now-this-is-how-copy-protection-should-be...>
"Original games do fade" -- turned you into the seagull
The protection description text was on the loading screen, white letters on dark by, bottom-center