发明名称 |
CONTENT PROTECTION SYSTEM, KEY DATA GENERATION APPARATUS, AND TERMINAL APPPARATUS |
摘要 |
<p>A content protection system prevents illegal key acquisition, without checking uniqueness of device keys. The content protection system includes a key data generation apparatus and a user terminal. The key data generation apparatus converts first key data, which is for using content, based on a predetermined conversion rule, thereby generating second key data, encrypts the second key data using a device key held by valid terminals, and outputs the encrypted key data. The user terminal obtains the encrypted key data, decrypts the encrypted key data using a device key held by the user terminal, thereby generating second key data, converts the second key data based on a re-conversion rule corresponding to the conversion rule, thereby generating the first key data, and uses the content with use of the generated first key data.</p> |
申请公布号 |
WO2004064313(A1) |
申请公布日期 |
2004.07.29 |
申请号 |
WO2004JP00155 |
申请日期 |
2004.01.13 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;NAKANO, TOSHIHISA;OHMORI, MOTOJI;MATSUZAKI, NATSUME;TATEBAYASHI, MAKOTO;YAMAMOTO, NAOKI;ISHIHARA, HIDESHI |
发明人 |
NAKANO, TOSHIHISA;OHMORI, MOTOJI;MATSUZAKI, NATSUME;TATEBAYASHI, MAKOTO;YAMAMOTO, NAOKI;ISHIHARA, HIDESHI |
分类号 |
G11B20/00;H04L9/08;H04L29/06;(IPC1-7):H04L9/08 |
主分类号 |
G11B20/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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