Information security – Access control or authentication – Network
Reexamination Certificate
2011-01-18
2011-01-18
Abrishamkar, Kaveh (Department: 2431)
Information security
Access control or authentication
Network
C726S017000, C726S027000, C726S028000, C726S029000, C726S030000, C380S279000
Reexamination Certificate
active
07873987
ABSTRACT:
In a content delivery system including a server and content processing apparatus connected to each other across a network, a content delivered by the system is encrypted with a content key Kc, and supplied along with a sublicense encrypted with a work key Kw to a DTV. The sublicense includes a second use condition under which a content is used and a content key Kc for decrypting an encrypted content. The work key Kw for decrypting an encrypted content is included in a main license. The main license is supplied to the DTV separately from the content. The main license includes, in addition to the work key Kw, a first use condition under which a content under a subscription contract is used.
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Computer translation of JP 2000207309 A.
European Patent Office Supplemental Search Report in Application No. 04820519.9-1241, dated Aug. 19, 2010 (3 pages).
Dewa Yoshiharu
Kagemoto Hideki
Katayama Yasushi
Kitazato Naohisa
Murakami Hiroki
Abrishamkar Kaveh
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Panasonic Corporation
Sony Corporation
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