Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2006-10-10
2006-10-10
Song, Hosuk (Department: 2135)
Cryptography
Video cryptography
Copy protection or prevention
C380S200000, C380S202000, C380S203000, C380S227000, C380S228000, C380S229000, C380S230000, C713S169000, C713S193000
Reexamination Certificate
active
07120251
ABSTRACT:
A data player for reading contents encrypted by a decoding key from a digital medium, and playing the encrypted contents by using the decoding key which is stored in a key storage unit, comprises: a key obtaining unit for performing mutual authentication with the key storage unit to obtain the decoding key stored in the key storage unit; a key holding unit for holding the decoding key; a playback state obtaining unit for monitoring the playback state of the digital medium; and a contents decoding unit for decoding the encrypted contents by using the decoding key. The decoding key is obtained by the key obtaining unit and stored in the key holding unit, and the encrypted contents read from the digital medium is decoded with the decoding key by the contents decoding unit to play the contents. The decoding key stored in the key holding unit is discarded according to the playback state of the digital medium which is obtained by the playback state obtaining unit.
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Harada Shunji
Ibaraki Susumu
Katta Noboru
Kawada Hirotsugu
Tatebayashi Makoto
Dada Beemnet W
Matsushita Electric - Industrial Co., Ltd.
Song Hosuk
Wenderoth , Lind & Ponack, L.L.P.
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