| 摘要 |
A content use system is provided which permits the use of content under appropriate use conditions while maintaining a high security level. A host ( 100 ) includes a secure data management unit ( 105 ) which securely manages secure data, a host communication processing unit ( 101 ) which transmits secure data managed by the secure data management unit ( 105 ) to a card ( 200 ), and a playback unit ( 104 ) which uses the content in the case where use of the content is assessed to be permitted by the card ( 200 ); the card ( 200 ) includes a license management unit ( 203 ) which holds use conditions for the content, a card communication processing unit ( 201 ) which acquires the secure data from the host ( 100 ), and a usability assessment unit ( 204 ) which assesses whether or not use of the content is permitted by the host ( 100 ) based on the secure data acquired by the card communication processing unit ( 201 ) and the use conditions held in the license management unit ( 203 ).
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