The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2012
Filed:
Sep. 19, 2007
Koichi Takagi, Fujimino, JP;
Masaru Sugano, Fujimino, JP;
Yasuhiro Takishima, Fujimino, JP;
KDDI Corporation, Tokyo, JP;
Abstract
Degraded digital data is distributed from a serverto each user A, B, C, and D. An encrypted degradation compensation module is also delivered to the digital data duplicating apparatusfor the user A. The digital data duplicating apparatusdecrypts 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.