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.
I think that was arma 2. It also turned the player into a pigeon after a while.
It had, another thing is that it used somewhat questionable system for CD key validation, which is stubbed out in this release (https://github.com/BohemiaInteractive/CWR/blob/main/engine/P...).
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.