How to distinguish a license from a pirate?

Question

Software and Internet Services

Tell me a 100% way to distinguish a licensed disc with a game. The fact is that a neighbor bought a couple of used discs with games as licenses, before launching GTA4 he noticed the inscription razor 1911) and the key is naturally not in the box, although without this it cannot be distinguished from a license: two 8GB discs in a beautiful box with a poster-map of the city, a stripe and stickers, and the game itself without lags) But if everything is clear with this one, then with the rest I’m confused about arma2 and the witcher with keys, but they are pasted in the box, on the paper clapboard, maybe they they generated it with a keygen and pasted it .., but in pure there is no key, but in the autorun there is a button to update the game ... I'm confused ..
Thank you.

Answer 1

What is there to distinguish, pirate, of course.
As for the rest - you can try to feed the key to the stim.