Re: Copyright Problems when i specifically posted "no copyright intended, all rights go to Valve"
Even if you say "no copyright infringement intended", that doesn't mean there isn't an infringement of copyright. It'd be like leaving a note saying "I didn't mean to steal your wallet" after nicking somebody's wallet :p
In short, you can't do anything - if a copyright claim has been put against your video all you can do is counter-claim, but given that it's a game trailer you won't really have a leg to stand on. Sorry!