Protecting copyrighted digital content against unauthorized copying

摘要

A copy control apparatus is provided in one-to-one correspondence with a car navigation system. Connection of the copy control apparatus with an information processing apparatus such as a PC enables to transmit content only from the information processing apparatus to which the copy control apparatus is connected to the car navigation system. With this configuration, the copy control apparatus stores a device key used to encrypt the content, and encrypts the device key with another encryption key to transmit the encrypted device key to the information processing apparatus. The information processing apparatus encrypts a copy of the content by use of the received device key, and then sends the encrypted copy to a content receiving apparatus. The content receiving apparatus decrypts the received copy of the content by use of a stored device key, and then stores the decrypted copy of the content in a storage unit.