How was CSS supposed to protect against copying the encrypted data? We should not need to decrypt the video to duplicate the disc.
Keys were stored on an area of the disc that wasn't writable on DVD-Rs so you couldn't copy the whole disc.
It's implemented in drive firmware, so the drive will refuse to read protected sectors without authentication.
Keys were stored on an area of the disc that wasn't writable on DVD-Rs so you couldn't copy the whole disc.