CONTENT TRANSFER CONTROL METHOD, CONTENT TRANSFER CONTROLLER, STORAGE MEDIUM FOR CONTENT TRANSFER CONTROL PROGRAM, AND STORAGE MEDIUM FOR CONTENT

摘要

PROBLEM TO BE SOLVED: To prevent replay attacks by a method where contents stored in a storage medium are backed up, when they are made transferable to another storage medium and a means is provided for making the backup contents unusable, even if they are returned to the original storage medium after the contents have been transferred. SOLUTION: The contents or use control information reserved in the storage medium 30 are bound by using information, in a security area 32 provided in the storage medium 30. Each time the contents in the storage medium 30 are transferred, the information in the security area 32 is rewritten, to rebind the contents or the use control information. Only when the information in the security area 32 has the value held when the bind is made, is the bound information enabled. If the information in the security area 32 is different from the value held when the bind is made, the bound information is disabled.