Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2008-04-08
2008-04-08
Zia, Syed A. (Department: 2131)
Cryptography
Video cryptography
Video electric signal modification
C380S200000, C380S239000, C380S230000, C380S231000, C705S052000
Reexamination Certificate
active
07356144
ABSTRACT:
A method of transmitting a content to a reception side includes the steps of encrypting the content by use of a scramble key that varies with time, encrypting scramble-key-associated information that includes at least the scramble key and usage-control information, the usage-control information indicative of usage of the content on the reception side, and transmitting the encrypted content and the encrypted scramble-key-associated information to the reception side.
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Kurioka Tatsuya
Namba Seiichi
Nishimoto Yusei
Okuda Haruo
Uehara Toshihiro
Ladas and Parry LLP
Nippon Hoso Kyokai
Zia Syed A.
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