Cryptography – Key management
Reexamination Certificate
2008-04-28
2011-11-29
Srivastava, Vivek (Department: 2433)
Cryptography
Key management
C713S150000
Reexamination Certificate
active
08068611
ABSTRACT:
A method is provided of playing a broadcast program content, which includes: (a) producing a combination-dependent unique key which is unique to a combination of a tuner unit and a computer unit; and (b) in response to issuance of a real-time play command or a recorded-video playback command from a user, playing a broadcast program content in real-time after transmission thereof from the tuner unit to the computer unit, or playing back recorded data after retrieval thereof from a data storage. In an illustrative embodiment, the produced combination-dependent unique key is outputted into an encryptor of the tuner unit for encryption, and the encrypted digital data is inputted into the computer unit. A decryptor of the computer unit is caused to attempt decryption of the encrypted digital data, using the produced combination-dependent unique key.
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Takagi Yoshiyuki
Takahashi Ryosuke
Yamagishi Yoshikazu
Buffalo Inc.
Jhaveri Jayesh
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Srivastava Vivek
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