Method and apparatus for controlling playback of recorded HDTV s

Details Method and apparatus for controlling playback of recorded HDTV s Method and apparatus for controlling playback of recorded HDTV s

1992-05-22

1995-10-24

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 5, 380 20, H04N 767

Patent

active

054616743

ABSTRACT:
An HDTV receiver for restricting playback of HDTV signals encrypted with a level 1 encryption. The receiver includes an output port and an input port between which an external, controllable level 1 decryption apparatus is connected. The receiver includes a level 2 encryption circuit coupled to the output port and a level 2 decryption circuit coupled to the input port. The level 1 external decryption apparatus may be controllable from a cable head end, a smart card or a built-in algorithm to control the number of playbacks of recorded level 1 encrypted HDTV signals.

REFERENCES:
patent: 4670857 (1987-06-01), Rackman
patent: 5016272 (1991-05-01), Stubbs et al.

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