Receiving station management apparatus

Details Receiving station management apparatus Receiving station management apparatus

1994-12-27

1997-02-25

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

348 6, 348 10, 380 9, 380 20, 380 21, 380 23, 380 49, H04N 7167, H04L 900

Patent

active

056066112

ABSTRACT:
In a transmitting unit, receiving stations are formed into a plurality of groups, and information associated with the right to receive a broadcasting service is rewritten in units of groups by converting the information into a packet (group information) and transmitting it together with video and audio signals. In each receiving station, group information is extracted from a received signal, and a group number included in the received packet is compared with a group number stored in a memory in advance. When they coincide with each other, information associated with the right to receive a broadcasting service is written in the memory. With this operation, information associated with the right of each receiving station to receive a broadcasting service is efficiently transmitted.

REFERENCES:
patent: 4736421 (1988-04-01), Morita et al.
patent: 4739510 (1988-04-01), Jeffers et al.
patent: 4991207 (1991-02-01), Shiraishi et al.
patent: 4998278 (1991-03-01), Sasa
patent: 5204900 (1993-04-01), Pires
patent: 5351294 (1994-09-01), Matsumoto et al.

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