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    • 35. 发明申请
    • ENCRYPTED CONTENT AND DECRYPTION KEY PROVIDING SYSTEM
    • 加密内容和分解密钥提供系统
    • US20090235303A1
    • 2009-09-17
    • US12063184
    • 2006-08-02
    • Masaru YamaokaMamoru ShojiTakahiro SatoMitsuaki OshimaShinichi Tanaka
    • Masaru YamaokaMamoru ShojiTakahiro SatoMitsuaki OshimaShinichi Tanaka
    • H04N7/167H04L9/08H04N5/91
    • H04N7/1675G06Q30/02H04L9/08H04L63/0428H04L63/06H04L2209/60H04N21/4181H04N21/4405H04N21/44204H04N21/4623H04N21/812H04N21/8355
    • Not only is it possible to let the viewers watch information that an information provider wants watched by the viewers in a reliable manner, but it is also possible to provide the viewers with information that the information provider desires. A content providing server 1 appends an encryption key ID of an encryption key used when encrypting content data to the content data encrypted using the encryption key and transmits the content data appended with the encryption key ID to a content reproduction device 3, while it transmits the encryption key to a CM providing server 2. The CM providing server 2 embeds the encryption key into CM data and transmits the CM data in which is embedded the encryption key corresponding to the encryption key ID that has been received from the content reproduction device 3 to the content reproduction device 3. The content reproduction device 3 transmits the encryption key ID to the CM providing server 2 and reproduces the CM data received from the CM providing server 2 to decrypt the content data using the encryption key embedded in the CM data, after which it reproduces the decrypted content data.
    • 不仅可以让观众以可靠的方式观看信息提供者希望观看者观看的信息,还可以向观众提供信息提供者所期望的信息。 内容提供服务器1将加密内容数据时使用的加密密钥的加密密钥ID附加到使用加密密钥加密的内容数据,并将附加有加密密钥ID的内容数据发送到内容再现装置3, 加密密钥到CM提供服务器2.CM提供服务器2将加密密钥嵌入到CM数据中,并将其中嵌入有与从内容再现设备3接收到的加密密钥ID相对应的加密密钥的CM数据发送到 内容再现装置3.内容再现装置3将加密密钥ID发送到CM提供服务器2,并且再现从CM提供服务器2接收的CM数据,使用嵌入在CM数据中的加密密钥来解密内容数据,之后 它再现了解密的内容数据。