Origin always let you use the key, they'll show infos about the game and ask if you want to proceed.
If the key is not duped a green bar will appear saying that you have activated it and if the key is duped a red bar will appear.
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Okay, I have a BF3 EP key I know for a fact was activated. Just to see what would happen, I tried the key in Origin and it actually was going to let me use it!
I didn't though, what happens if you do that? I'm just curious as to why it works at all.
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