Method to secure a broadcasted event
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United States of America Patent
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N/A
Issued Date -
Feb 2, 2006
app pub date -
Mar 9, 2005
filing date -
Mar 10, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The aim of this invention is to propose a solution to prevent the modification of access conditions to an encrypted multimedia content. This aim is achieved by a method to secure an event with control words (CW), the use of this event by user units being subjected to access conditions (AC), said method comprising the following steps: generation of a pseudo-random number (RNG), formation of a control block (CB) by the association of the pseudo-random number (RNG) and the access conditions (AC), calculation of the control word (CW) by the application of a unidirectional function (F) on the control block (CB), use of the control word (CW) to encrypt the event, transmission of the control block (CB) to the user units.
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