System for denying access to content generated by a compromised off line encryption device and for conveying cryptographic keys from multiple conditional access systems
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United States of America Patent
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Aug 14, 2007
Grant Date -
Jun 20, 2002
app pub date -
Jul 3, 2001
filing date -
Oct 26, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for forwarding messages containing cryptographic keys from a conditional access system that controls a population of set-top boxes to an encryption renewal system. The method includes storing a fictitious address of a virtual set-top box; generating a message based on the fictitious address, the message containing a cryptographic key; and forwarding the message to the fictitious address of the virtual set-top box. The encryption renewal system has information regarding the virtual set-top box, and is the recipient of the message. In addition, the encryption renewal system is for controlling access to pre-encrypted content generated by an encryption device. The system includes software instructions for receiving a request to retrofit an entitlement control message that allows a home device to access pre-encrypted content; and software instructions for retrofitting the entitlement control message only after verifying that the pre-encrypted content was generated prior to or contemporaneous with an authorized timestamp.
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