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

Content playback apparatus, content playback method, computer program, key relay apparatus, and recording medium
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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