Countdown system for conditional access module

Details Countdown system for conditional access module Countdown system for conditional access module

H - Electricity

04

L

H04L 9/28 (2006.01) H04N 5/00 (2006.01) H04N 5/44 (2006.01) H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2167222

A digital conditional access module for a subscriber terminal comprises a decryption device including at least one the packet identification code (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 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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