Information security – Prevention of unauthorized use of data including prevention... – Limitations on number or amount of copies
Reexamination Certificate
2007-06-05
2007-06-05
Zand, Kambiz (Department: 2134)
Information security
Prevention of unauthorized use of data including prevention...
Limitations on number or amount of copies
C726S026000, C726S030000
Reexamination Certificate
active
10123557
ABSTRACT:
The present invention is intended to significantly reduce the content data processing and transfer times by skipping root key checking processing, when transmitting a plurality of pieces of encrypted content data stored in a primary recording medium to a secondary recording medium along with key information of these plural pieces of content data, if the key information for a piece of content data to be transmitted from the primary recording medium is the same as the key information for an already transmitted piece of content data.
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R. Canetti et al., “Multicast Security: A Taxonomy and Some Efficient Constructions,” INFOCOM 1999, 18thAnnual Joint Conference of the IEEE Computer and Communications Societies Proceedings, Mar. 21-25, 1999, pp. 708-716, vol. 2, New York, NY.
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Abe Miki
Hosoi Takafumi
Matsuda Hiromi
Tanaka Masao
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Powers William S
Sony Corporation
Zand Kambiz
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