Key management system for DVD copyright management

Details Key management system for DVD copyright management Key management system for DVD copyright management

1996-11-05

1999-06-22

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 5, 380 9, 380 10, 380 23, 380 25, 380 30, 380 49, 380 50, 705 1, H04L 900, H04L 930, H04N 7162

Patent

active

059150181

ABSTRACT:
A cryptographic system and method for secure distribution and management of cryptographic keys for use in a DVD copy protection scheme is disclosed. A DVD disc having compressed, encrypted content written on a first portion of the disc, and the content encryption key, itself encrypted with a second key and written out of band on a second portion of the disc is used to provide content, key, and control information to a DVD drive according to the present invention. The DVD drive is coupled to a decompressor and a video controller. The video controller and DVD drive engage in a handshaking protocol in which all of the communication between them is encrypted. After verifying that the video controller is registered and not known to be compromised, the DVD drive passes the content key and control information to the video controller, and the compressed, encrypted content to the decompressor. The content decompressed by the decompressor is communicated to the video controller where it is decrypted and converted to video signals. The control information instructs the video controller as to whether an optional analog protection scheme should be applied to the video signals prior to delivering the video signals to the display.

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