Countdown system for conditional access module
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United States of America Patent
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-
Dec 31, 1996
Grant Date -
N/A
app pub date -
Jan 18, 1995
filing date -
Jan 18, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A digital conditional access module for a subscriber terminal comprises a decryption device including at least one PID register and an associated countdown register. The decryption device is enabled for decrypting received product packets having a PID matching a PID stored in the PID register so long as the associated countdown register is characterized by a non-zero value. Decryption of a product packet results in the countdown register being decremented by a selected factor, the countdown register being prevented from assuming a zero value by setting its contents to a selected value in response to a received conditional access packet containing a PID matching the PID stored in the PID register. The selected value to which the countdown register is set may also be contained within the received conditional access packet.
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