DriveCrypt Plus Pack (DCPP) is a Full disk encryption software package which encrypts the operating system, and allows pre-boot authentication. The user can enter a password on computer start up, before the operating system boots up. DCPP is the only software on the market abel to hide the entire operating system inside another operating system. This is especially usefull if you are forced to reveal the password to an attacker. In this case he will only see prelared data.