cod6 serial saved

Hey, i installed cod6 over steam, like i downloaded it over it.
Now my question is where is the serial saved?
Id rather install it myself without steam and just use the serial instead.
Any help guys?

If you buy it through Steam I don't think you get a serial.

No, you dont get a serial through steam. It's autamatically assigned to your account.

dude if you bought it from a store then the serial will be on the back of your info book if you bought it on steam theres no serial required it auto matically saves the game on ur ac