If I bought a pc game like "crysis" how would I go about getting an activation key for it?

[DarXSIM]

Getting an activation key for used games

 

[Alabalcho]

Ask the seller

 

[James Mason]

The seller should be providing you with an activation key, that's the only thing you're actually buying that has any value. CDs are worthless.

 

[HideOut]

and newer games have the key bound to an account that basically makes it impossible to sell used.