Far Cry 2 is the latest PC game to use SecuROM protection, according to this Blues post, and will apparently allow five installs on three computers.
According to that story, based on this forum post from a Ubi rep, “Uninstalling the game ‘refunds’ an activation. This process is called ‘revoke’, so as long as you complete proper uninstall you will be able to install the game an unlimited number of times on three systems.”
There’s more through there. The game’s out on October 24.