Playing without disc, but know product key?

[sycles]

My cousin just got tdu for pc, but he left it at my house. I had already installed the game on his computer, and I have his product key. Is there a way that he can play the game without the disc but by putting in the product key somewhere instead?

[Camel]

There's no legal way of doing it like that. And if he did, his IP address or product key would get blocked so he wouldn't be able to play online.

[sycles]

Oh, alright then, but actually my problem is resolved now. Thanks!