发明授权
- 专利标题: Encrypted data delivery system
- 专利标题(中): 加密数据传送系统
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申请号: US10471803申请日: 2002-06-13
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公开(公告)号: US07404076B2公开(公告)日: 2008-07-22
- 发明人: Toshihisa Nakano , Motoji Omori , Makoto Tatebayashi
- 申请人: Toshihisa Nakano , Motoji Omori , Makoto Tatebayashi
- 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
- 代理机构: Wenderoth, Lind & Ponack, L.L.P.
- 优先权: JP2001-233223 20010801
- 国际申请: PCT/JP02/05874 WO 20020613
- 国际公布: WO03/015344 WO 20030220
- 主分类号: H04L9/00
- IPC分类号: H04L9/00
摘要:
A system structured from a management device, a content key distribution device and a plurality of terminals suppresses the data volume of a terminal revocation list (TRL). The management device generates and transmits a TRL formed from data that expresses terminal IDs of all terminals to be invalidated, by only a value and a position of a common bit string in the IDs, to the content key distribution device. Each terminal holds a terminal ID that includes a manufacturer, ID and a serial number, and requests the distribution of a content key by sending the terminal ID to the content key distribution device. The content key distribution device refers to the TRL, judges whether the terminal ID transmitted from the terminal is that of an invalidated terminal, and if negative, encrypts and transmits the content key to the terminal.
公开/授权文献
- US20040098579A1 Encrypted data delivery system 公开/授权日:2004-05-20