Process for the broadcasting of conditional access programs perm

Details Process for the broadcasting of conditional access programs perm Process for the broadcasting of conditional access programs perm

1993-12-27

1995-08-15

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 19, H04N 7167

Patent

active

054427010

ABSTRACT:
A process for broadcasting conditional access programs which permits a progressive access. Scrambled program data is transmitted along with partial access checking messages and complete access checking messages such that subscribers having a partial access right may descramble portions of the scrambled data corresponding to information regarding only the identity of the conditional access programs, and subscribers having a complete access right may descramble the remainder of the scrambled data and view the conditional access programs. The conditional access programs may be television pictures, radio programs, or data broadcasts.

REFERENCES:
patent: 4994909 (1991-02-01), Graves et al.

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