Selling CoD4? (online key activation question)

[Cybergangster]

I'm getting rid of a few games shortly but one I'm not sure about is Call of Duty 4. I've played the game a bit online so the key has been used (although I can't recall going through a registration process). Is uninstalling this title enough to free up my key or is this going to be a problem for whoever buys this off me?

 

[Cybergangster]

Thanks - That's what I thought. But with all the squealing about DRM last year I thought I'd check first.