"Good news! As promised, all activation restrictions, including install limits, have been removed from BioShock PC as of today.Activation limits removed on BioShock for the PC
You don’t have to patch or install anything for this to go into effect for your copy of BioShock – it’s already done!
Enjoy your time in Rapture, and thank you for supporting BioShock and the 2K teams."-----
"Our other methods of copy protection remain. You will still have to activate your copy, and you will still need to keep the disc in the drive.
SecuROM has not been removed -- just the activation limits on number of installs and number of computers you can install BioShock on simultaneously.
As I promised that the activation limits would go away, I can promise that if we ever stop supporting BioShock in the ways you speak of, we will release a patch so that the game is still playable.
I believe, as you seem to, that BioShock will be the kind of game we will want to revisit 5, 10, 15 or more years from now. I want my copy to be playable, just as you do, and so does 2K."
Bioshock can only be installed on two computers