This invention discloses a secure recording medium having at least one of audio, video and software content, comprising a plurality of media recording disks (DVD's) with a disk security chip embedded in each the DVD, each the disk chip comprising a security key, wherein at least two of the DVD's have...http://www.google.de/patents/US7031470?utm_source=gb-gplus-sharePatent US7031470 - Protection of data on media recording disks
