Doom 3 Exploit

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Just spotted this bit of Info over at Guru 3D's Forum posted by Tidus.

I run #doom3 on the IRC network Gamesurge and something occured yesterday that I thought I'd alert you all of so it doesn't happen to you. A user, posted a link that showed how to play co-op mode. I didn't think anything of it. I went afk for a while to do some work and I came back to a channel going nuts. Apparently this link led to website that claimed you needed to have a special .pak in order to play co-op. People downloaded it and joined this server this kid pasted. Upon joining, their game crashed and when they tried to log back in they got "CD key in use".