Protocol for controlling access, through specific time ranges, to scrambled data
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United States of America Patent
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Issued Date -
Jun 9, 2005
app pub date -
Sep 3, 2004
filing date -
Mar 6, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a protocol for controlling access to scrambled data in specific time ranges, using access control messages ECM. The protocol consists: in assigning (A) each access control message ECM a number (T.sub.j) satisfying a monotonic non-decreasing function, the messages representing a timebase formed by a plurality of individual time intervals for sending successive quanta of information; in detecting (B) in each descrambling terminal the numbers of the access control messages, and then, in response to a user request (UR) from the user; in selecting (C) an access control message number that corresponds to the sending time of the request to constitute a time origin (T.sub.jo) of the timebase; and in authorizing (D), (E) access to the scrambled information as a function of a specific access criterion with reference to the origin (T.sub.jo) and over a time range corresponding to a plurality of individual time intervals defining a plurality of successive quanta of scrambled information. Application to pay TV access control.
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