Public communication system comprising distributed stations, and station and sub-station for use in such a communication system
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United States of America Patent
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-
Sep 1, 1992
Issued Date -
N/A
app pub date -
Dec 21, 1990
filing date -
Feb 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A public communication system for encrypted audio/video information has various selective entitlement organizations with respect to its distributed receiver station. Such receiver station comprises one or more receiver sub-stations for decrypting the received encrypted information by means of a decrypting key. Furthermore, the receiver station comprises one or more description key sub-stations that may be interrogated by the receiver sub-stations and thereupon may verify a conditional access requirement, and in case of positive verification, forward decryption key information to the interogating receiver sub-station. All said sub-stations are interconnected by a serial standard bus, so that the configuration of a station is flexible and may even be altered dynamically.
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