There are provided, on a single LSI (114), a device inherent value (17) that is a predetermined constant value; a key generation means (18) for generating a key for encrypting a device key (11) that is the basis for generating a contents key, by using the device inherent value (17) and device inherent information (16) given to a device; and a device key encryption means (12) for encrypting the device key (11) using a key generated by the key generation means (18) to output an encrypted device key.
展开▼
