Halflife 2 - Internet activation and after....?

[evil_pikatchu]

Hello !

Just got back from holiday, I've read a lot about the HL2 internet activation that must be done with Valve. There is much discussion about sense and so on, copy protection nonsense, etc.

But my question is:
If i buy the game, then activate it with Valve, once i've finished it, will i be able to resell it, or will i'have to keep it all my life without possibility of getting rid of it ??
As the game is registered on my name how can i sell it to someone else ?
I always resell my games after completing them, there are not many games i've played twice, so why keeping them wasting lots of free space home...
Is like buying a car that you can't resell.....
Thx for comments on this one, maybe someone knows...