Cryptography – Key management
Reexamination Certificate
2006-04-26
2009-06-09
Abrishamkar, Kaveh (Department: 2431)
Cryptography
Key management
C380S044000, C713S193000
Reexamination Certificate
active
07545943
ABSTRACT:
A content playback apparatus includes an SKF selecting unit that selects one segment key file from plural segment key files recorded in a DVD media at a time of playback of a content of the sequence key section, a data selecting unit that selects each content corresponding to a segment number of each key entry registered in the selected segment key file, a moving picture data decrypting unit that decrypts the selected moving picture data by a segment key corresponding to the segment number, and a decoder that plays back the decrypted moving picture data.
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patent: 2004/0109569 (2004-06-01), Ellison et al.
patent: 1 548 732 (2005-06-01), None
Intel Corporation et al., “Content Protection for Prerecorded Media Specification DVD Book”, Revision 0.93, pp. I-X, 1-1 to 1-2 and 2-1 to 2-9, 2001.
Intel Corporation et al., Advanced Access Content System (AACS) Pre-recorded Video Book, Preliminary Draft Revision 0.90, pp. I-X and 1-28, 2005.
Intel Corporation et al., “Advance Access Content System (AACS) Introduction and Common Cryptographic Elements”, Preliminary Draft Revision 0.90, pp. I-XII and 1-58, 2005.
Haruki Kosuke
Ishihara Atsushi
Isozaki Hiroshi
Kamibayashi Tooru
Kashihara Yutaka
Abrishamkar Kaveh
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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