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US 8,134,903 B2Granted
Method and apparatus for digital data accompanied by degradation
AssigneeKddi Corporation
InventorsKoichi Takagi, Masaru Sugano, Yasuhiro Takishima
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AssigneeKddi Corporation
InventorsKoichi Takagi, Masaru Sugano, Yasuhiro Takishima
Estimating the term…
Degraded digital data is distributed from a server 1 to each user A, B, C, and D. An encrypted degradation compensation module is also delivered to the digital data duplicating apparatus 2 for the user A. The digital data duplicating apparatus 2 decrypts the encrypted degradation compensation module using its own encryption key, when playing digital data, to generate a 100% degradation compensation module. This module is applied to the degraded digital data to compensate the degradation thereof. An encrypted degradation compensation module of which the degradation compensation capability is reduced is delivered from the user A to the user B. The user B can use the encrypted degradation compensation module of which the degradation compensation capability is reduced from the user A to replicate the degraded digital data.
A method for duplicating digital data accompanied by degradation, including duplicating a digital data degradation compensation module for compensating the degradation of digital data that is distributed from a content source and degraded reversibly in advance, the method comprising a degradation compensation capability reducing step of reducing the degradation compensation capability of the digital data degradation compensation module, performed when the digital data degradation compensation module is duplicated, wherein the digital data degradation compensation capability is hierarchized and the degradation compensation capability reducing step is adapted to reduce the degradation compensation capability stepwise with the repetition of duplicating the digital data degradation compensation module.
A method for duplicating digital data accompanied by degradation, including duplicating a digital data degradation compensation module for compensating the degradation of digital data that is distributed from a content source and degraded reversibly in advance, the method comprising a degradation compensation capability reducing step of reducing the degradation compensation capability of the digital data degradation compensation module, performed at predetermined time intervals after the digital data degradation compensation module is received, wherein the digital data degradation compensation capability is hierarchized and the degradation compensation capability reducing step is adapted to reduce the degradation compensation capability stepwise after the predetermined time intervals.
A digital data duplicating apparatus accompanied by degradation for duplicating digital data that is degraded reversibly in advance, the apparatus comprising:
Dependencies are inferred from the claim text.