CONTENT DATA PROCESSING DEVICE, RECORDING/REPRODUCTION DEVICE, AND RECORDING/REPRODUCTION SYSTEM

摘要

In the case of the ordinary Move function, the original content is erased and when normal move cannot be performed, the content is lost. This problem can be solved without departing from the Move concept of copy once. Unique IDs are acquired from at least two recording device and a mutual ID having the unique ID and a mutual encryption key as elements is created. Here, it is assumed that when the mutual ID is copied together with the encrypted content to another recording device, the original mutual ID is deleted. In a recording device where the mutual ID and the encrypted content are both recorded, reproduction and decryption is enabled when one of the unique IDs in the mutual ID is matched with the unique ID of the recording device.