This key is from IndieGala challenges so there's a possibility that it's a duplicate; I already have it so I can't tell I'm afraid. If it's a duplicate then I'm afraid there's nothing I can do but offer my apologies and ask you to consider allowing me to delete this giveaway but otherwise do as you wish.
As far as I can tell there aren't any region restrictions but I can't be sure so caveat emptor and all that. Anyways, good luck and enjoy.