Process for promotion of pay television broadcasts, and device f

Details Process for promotion of pay television broadcasts, and device f Process for promotion of pay television broadcasts, and device f

1990-12-10

1993-03-30

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 17, 358143, H04N 7167

Patent

active

051990679

ABSTRACT:
The process of the invention concerns pay television networks with reinforced scrambling. To attract potential subscribers, the invention consists in cyclically transmitting non-scrambled images for brief periods, so that the type of program can be seen.

REFERENCES:
patent: 4635113 (1987-01-01), Okada et al.
patent: 4700386 (1987-10-01), Kohn
patent: 4893248 (1990-01-01), Pitts et al.
patent: 4991011 (1991-02-01), Johnson et al.
patent: 5003384 (1991-03-01), Durden et al.
Funkschau, vol. 57, No. 8, Apr., 1985, pp. 58-61, G. Bock, "So Funktioniert Scrambling".
Electronics, vol. 42, No. 11, May 26, 1969, pp. 123-128, F. Corey, "Pay TV Gets in the Broadcast Pictures".

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