Control message processing method
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United States of America Patent
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May 28, 2013
Grant Date -
Aug 13, 2009
app pub date -
May 29, 2007
filing date -
May 29, 2006
priority date (Note) -
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Abstract
A method for processing a set of control messages used to access an encrypted stream by a multimedia unit. These messages include a discrimination parameter having a different value for at least three consecutive non-redundant messages in the stream. The method includes the steps of receiving a current control message; reading the discrimination parameter from the current control message; retrieving from a memory the discrimination parameter from the message processed previously; comparing the current and previous discrimination parameters; and blocking said current control message if the comparison step indicates that the discrimination parameters are identical. The method is characterized in that the discrimination parameter is unique and different for each message in the set of control messages, such that, during the filtering step, the current message and the previously processed message can be non-consecutive in the ordered subset of messages.
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