Video control system for recorded programs

Details Video control system for recorded programs Video control system for recorded programs

1990-03-29

1991-10-01

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 20, H04N 7167

Patent

active

050540645

ABSTRACT:
A video system includes a central facility and a terminal. Means are provided for playing a video recording medium storing a video program including a series of television fields including a first field containing both a random digital code encrypted according to a code encryption key and program identification data, and a second field containing an unintelligible video signal previously transformed from a intelligible video signal according to the random digital code. The terminal includes means for sending the program identification data to the central facility. The central facility includes a data base for storing and retrieving at least one code encryption key corresponding to the program identification data and means for sending the code encryption key from the central facility to the terminal. The terminal further includes means for receiving the code encryption key from the central facility, decrypting means for decrypting the encrypted digital code of the first frame in accordance with the code encryption key, and means for transforming the unintelligible video signal of the second frame to the intelligible video signal using the decrypted random digital code.

REFERENCES:
patent: 4567512 (1986-01-01), Abraham
patent: 4595950 (1986-06-01), Lofberg
patent: 4635112 (1987-01-01), Tomioka et al.

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