Invention Grant
US07940935B2 Content playback apparatus, content playback method, computer program, key relay apparatus, and recording medium
有权
内容再现装置,内容再现方法,计算机程序,密钥中继装置和记录介质
- Patent Title: Content playback apparatus, content playback method, computer program, key relay apparatus, and recording medium
- Patent Title (中): 内容再现装置,内容再现方法,计算机程序,密钥中继装置和记录介质
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Application No.: US11629352Application Date: 2005-06-30
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Publication No.: US07940935B2Publication Date: 2011-05-10
- Inventor: Tohru Nakahara , Ryuichi Okamoto , Masaya Yamamoto , Katsumi Tokuda , Masaya Miyazaki , Masayuki Kozuka
- Applicant: Tohru Nakahara , Ryuichi Okamoto , Masaya Yamamoto , Katsumi Tokuda , Masaya Miyazaki , Masayuki Kozuka
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- International Application: PCT/IB2005/003092 WO 20050630
- International Announcement: WO2006/046099 WO 20060504
- Main IPC: H04L9/08
- IPC: H04L9/08

Abstract:
A content playback apparatus reduces load concentration on a specific server apparatus that manages content keys of encrypted content, while protecting copyrights of the content. The content apparatus makes playback of content recorded in a recording medium sold possible after the specific server breaks down. A key acquisition control unit (204) reads a playback control information table (211) from a recording medium (102) via a reading unit (201). The key acquisition unit (204) acquires a rights key via a key acquisition intermediation unit (223) from an apparatus specified by an acquisition-destination type and a request-destination type that are stored in the playback control information table (211) and that corresponding to the content to be played. The key acquisition unit (204) generates a content key using the acquired rights key and, when required, a medium key recorded in a medium. A decryption unit (203) decrypts encrypted content using the content key.
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