| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the leakage of content stored in an information terminal by utilizing sensing information, and to effectively protect the content. <P>SOLUTION: In this content protection system, a removable device 20 connected to the information terminal 10 for storing encrypted content is provided with a means for internally encrypting identification information and location information. The information terminal 10 receives information which is obtained by encrypting the identification information and the location information from the removable device 20, and transmits the information to a management server 30, and requests a key necessary for decoding the encrypted content. In the management server 30, the encrypted information of the key acquisition request is decrypted, and whether or not the decoded location information satisfies predetermined decryption propriety conditions is determined by a policy determination part 33, and when it is determined that the decryption propriety conditions are satisfied, the management server 30 transmits the key necessary for decrypting the encrypted content of the information terminal 10 to the information terminal 10. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
