[wolfsrain]

Well, it happened with the ArmA before and it would be better to stay on the safe side. The game will not asked to enter it again, but the FADE will check at times for disc and an original CD-key. If Fade doesn't find the disc, you get bad accuracy and start to have some nasty things in your gameplay. If FADE doesn't detect the original key, you are turned into a seagull. And all the cracks for ArmA, ArmA2 and OP Flashpoint bypass the FADE CD-key check.