Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2003-04-01
2009-02-03
Vu, Kimyen (Department: 2135)
Cryptography
Video cryptography
Copy protection or prevention
C380S203000, C713S155000, C713S189000, C713S193000
Reexamination Certificate
active
07486791
ABSTRACT:
A reproducing method, reproducing apparatus, recording method and recording apparatus provide read/record data in an efficient way to a storage medium. The reproducing method includes the steps of selecting one of a plurality of tracks described in a play order table designating an order of reproduction of the tracks; reading track information corresponding to the selected track from a track information table which includes a coding system and a decryption key corresponding to each track, and a plurality of items of track information each of which has pointer information pointing to one of a plurality of items of part information within a part information table; reading the part information corresponding to the pointer information within the read track information, each of the plurality of items of part information having part pointer information pointing to part of a single audio file; reading that part of the audio file which corresponds to the part pointer information within the read part information; and decrypting the read part of the audio file based on the decryption key and the coding system.
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Hattori Masato
Kawakami Takashi
Kii Manabu
Ohbi Seiji
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
To Baotran N
Vu Kimyen
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