发明授权
US07401232B2 Content playback apparatus method and program and key management apparatus and system
有权
内容播放装置的方法和程序以及密钥管理装置和系统
- 专利标题: Content playback apparatus method and program and key management apparatus and system
- 专利标题(中): 内容播放装置的方法和程序以及密钥管理装置和系统
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申请号: US10482846申请日: 2003-03-18
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公开(公告)号: US07401232B2公开(公告)日: 2008-07-15
- 发明人: Takatoshi Ono , Yoji Kumazaki , Shigeru Yamada , Hiroki Murakami , Tetsuya Inoue , Motoji Ohmori
- 申请人: Takatoshi Ono , Yoji Kumazaki , Shigeru Yamada , Hiroki Murakami , Tetsuya Inoue , Motoji Ohmori
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 优先权: JP2002-078397 20020320; JP2002-364389 20021216; JP2003-054134 20030228
- 国际申请: PCT/JP03/03232 WO 20030318
- 国际公布: WO03/079689 WO 20030925
- 主分类号: G06F12/14
- IPC分类号: G06F12/14
摘要:
A key management apparatus which can be used to encrypt/decrypt content data in a content playback device includes a storing unit for storing a secret key, a key information decrypting unit for decrypting encrypted key information and an updating unit operable to update the secret key with an algorithm stored therein, when the decrypted key information is key-updating information. Seed information can be received for use with the algorithm to provide a new secret key, and preliminary trigger information can be used to poll a group of appliances to request key information to determine any duplication of appliances.