Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-08-14
2007-08-14
Barron, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Video electric signal modification
C380S210000, C380S239000, C380S240000, C725S031000
Reexamination Certificate
active
09898136
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.
REFERENCES:
patent: 6157719 (2000-12-01), Wasilewski et al.
patent: 6307939 (2001-10-01), Vigarie
patent: 6363149 (2002-03-01), Candelore
patent: 7023992 (2006-04-01), Kubota et al.
patent: 2002/0007494 (2002-01-01), Hodge
patent: WO 98/43426 (1998-10-01), None
patent: WO 00/67483 (2000-11-01), None
Functional Model of a Conditional Access System, EBU Project Group B/CA, EBU Technical Review No. 226, Dec. 1995, Retrieved from the Internet on May 19, 2005: <URL: http://www.ebu.ch/trev—266-contents.html>.
Chen Annie On-yee
Tang Lawrence W.
Wakabayashi Akiko
Barron Jr. Gilberto
Bethea, Jr. Thomas
Dinh Minh
General Instrument Corporation
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