“This copy protection system installs a driver that runs at the highest level of access on the system, which gives it low level access to the PCs hardware and any drivers and processes. This driver runs regardless of whether the game runs; keeping an eye out for any suspicious activity such as attempting to copy a protected disc. If something suspicious is detected, it forces the PC to make an immediate reboot, regardless of any other applications running and whether or not the user has any unsaved work.”
cdfreaks.com via Juha
Good Noodles.