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If you also give the buyer your STEAM account with which you activated the game then this would be possible, as your STEAM account is linked to the serial key of the retail version of the game. But if this is legal, that is another question... Most likely they do not allow this making it hard to resell HL2 and future online activated games (but then again they will be making more money when everyone has to buy a original non-activated version).
But it is also possible that Valve adds an option the deactivate/remove a serial from your STEAM account so you can resell it but this is highly unlikely...
To my knowledge, your do not own a copy of the game. You just "lease" it so therefor it can not be resold... (I read this somewhere but can not find where this was)
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