Video control system

Details Video control system Video control system

H - Electricity

04

N

350/20

H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2039123

A video system (10) includes a central facility (11) and a terminal (12). Video program means provide the terminal (12) with 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 an intelligible video signal according to the random digital code. The terminal (12) includes means for sending the program identification data to the central facility (11). The central facility (11) includes a data base (19) 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 (11) to the terminal (12). The terminal (12) further includes means for receiving the code encryption key from the central facility (11), decrypting means (23) 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. The video program means may transmit the program to said terminal or be located at the terminal (12) for playing a video recording medium (15) storing the program. A video recording medium (15) storing the program is also claimed.

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