Method and apparatus for preventing fraudulent access in a conditional access system
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United States of America Patent
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May 21, 2002
Issued Date -
N/A
app pub date -
Sep 21, 1999
filing date -
Mar 21, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A receiver/decoder is programed only to accept a current entitlement control message (EMM) if it has received at least a previous EMM of a previous calendar period. When this is received, it is used to check present rights in the receiver/decoder. The invention prevents an original subscriber from fraudulently obtaining rights by disconnecting a decoder (before an authorising message can update the decoder's memory to prevent decryption) and by reconnecting the decoder (so as to be mistaken for a new subscriber legitimately having those rights).
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