发明名称 |
KEY INFORMATION MANAGEMENT METHOD, CONTENT TRANSMISSION METHOD, KEY INFORMATION MANAGEMENT APPARATUS, LICENSE MANAGEMENT APPARATUS, CONTENT TRANSMISSION SYSTEM, AND TERMINAL APPARATUS |
摘要 |
The present invention aims to reliably prevent illegal use of content when the content is encrypted and transmitted with a cipher key. A content transmission method of the present invention includes: a basic key creating step of creating a basic key K1; a cipher key creating step of creating a cipher key Kn and also creating mutual cipher keys K2 through Kn-1; a first key encrypting step of encrypting the mutual cipher key K2 with the basic key K1, a second key encrypting step of encrypting the mutual cipher keys K3 through Kn-1 and the cipher key Kn by successively using the keys K2 through Kn-1; a content encrypting step of encrypting content C with the cipher key Kn; a first transmitting step of transmitting content Kn (C) and one part among key data K1 (K2), . . . , Kn-1 (Kn) to a terminal apparatus 2 through a broadcast wave; and a second transmitting step of transmitting another part among the key data K1 (K2), . . . , Kn-1 (Kn) to the terminal apparatus 2 through a communication network. |
申请公布号 |
US2012076300(A1) |
申请公布日期 |
2012.03.29 |
申请号 |
US201013260810 |
申请日期 |
2010.03.11 |
申请人 |
UCHIDA MOTOYUKI;ISHII KOJI;KANEDA TOSHIO;NTT DOCOMO, INC. |
发明人 |
UCHIDA MOTOYUKI;ISHII KOJI;KANEDA TOSHIO |
分类号 |
H04L9/14;H04L9/08 |
主分类号 |
H04L9/14 |
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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