2K Games has released an official tool to revoke activations for Bioshock. Enabling owners of the game to install it as often as they may wish on a limited number of PCs. The application is 4,9 MByte small and resembles the first solution to the DRM-based (Sony DADC -- SecuROM) activation limitations. Yet, it does not remove the restrictions to install the game on more than five PCs with the same license. Please consult the FAQ for further tricks and leashes or grab a copy in .pdf format.