StarForce (drm) also used VM. Good cracking groups ripped it out, bad/sloppy crackers emulated expected inputs. Emulation was often not enough because VM was a

StarForce (drm) also used VM. Good cracking groups ripped it out, bad/sloppy crackers emulated expected inputs. Emulation was often not enough because VM was a blackbox and you newer knew if you emulated everything VM would expect. This resulted in cracked game breaking few hours deep into the storyline when some late level triggered another hidden check.