Z:gnu-www-ja-copyright-versus-community--da053c-Eventually Sony came up with a/en

Eventually Sony came up with a clever idea. They put a program on the disk, so that if you stuck the disk into a computer, the disk would install the program. This program was designed like a virus to take control of the system. It's called a 'root kit', meaning that it has things in it to break the security of the system so that it can install the software deep inside the system, and modify various parts of the system.