Patent ID: 7464273
Filing Date: 2008-12-09
Classification: G06F

Abstract:
1. A content utilizing method in a system including a user terminal, a content server for providing a content, a content processing apparatus for processing a content, and a usage right control server for controlling a right of use of the content, the method comprising: a use requesting step of specifying a content to be used and a condition of use therefor in said user terminal and requesting a use of the specified content to said content server; a content package transmitting step of encrypting the specified content with a first encrypting key in said content server and transmitting a content package including the encrypted content and a license control assistant program to said content processing apparatus; a license control information transmitting step of generating, in said content server, license control information including the license identifier, usage right information having the specified condition of use and a content identifier of the specified content, and a second encrypting key, and executing transmission together with a decrypting key corresponding to the first encrypting key to said usage right control server; a ticket transmitting step of generating, in said content server, a ticket including the license identifier and a second decrypting key corresponding to the second encrypting key and transmitting the ticket to said content processing apparatus; an execution step of executing, in said content processing apparatus, the license control assistant program included in the content packet for extracting the license identifier from the ticket and for transmitting the license identifier from said content processing apparatus to said usage right control server, and an authorization step of verifying, in said usage right control server, an authorization for use of the user by communicating with the license control assistant program executed in said content processing apparatus using the second encrypting key contained in the license control information corresponding to the transmitted license identifier; a usage right information transmitting step of transmitting, after the authorization is verified, the usage right information and the first decrypting key from said authorizing server to said content processing apparatus; and a content processing step of decrypting the encrypted content by the first decrypting key in said content processing apparatus and processing the decrypted content based on the usage right information.