None, as long as it's a Steam CD-key (Which Dirt 3 keys are) then yeah you're good to go.
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Yeah, I own it and it's a Steam key, just can't add it to my account because I already have Dirt 3.
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It's so hard to find one that is not activated :-(
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I currently have a Dirt 3 CD key I'm going to use, was wondering if there's anything against emailing the winner a CD key rather than gifting the game through Steam, as I can't add it my library since I already own it.
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