System for controlling access to broadcast transmissions
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United States of America Patent
Stats
-
Jan 25, 1994
Issued Date -
N/A
app pub date -
Dec 18, 1992
filing date -
Nov 14, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast and a plurality of selectable and portable executing apparatus each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by the associated receiving decoder to enable the receiving decoder to descramble the broadcast.
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