RECORDING/REPRODUCING DEVICE OF TRANSMITTER AND RECORDING/REPRODUCING DEVICE OF RECEIVER

摘要

A conventional recording and reproducing apparatus cannot move second copyright-protected AV data while moving a first copyright-protected AV content when moving such AV data via a network because the recording and reproducing apparatus issues an exchange key to be used for decrypting the AV data to a single receiving-side recording and reproducing apparatus only. The recording and reproducing apparatus of the present invention generates a new exchange key as a random number and transmits the new exchange key each time an exchange key for use in a move mode is requested; while it always transmits an identical exchange key when a normal exchange key is requested. The recording and reproducing apparatus selects an exchange key to be used according to the address of a recording and reproducing apparatus which is the transmission destination when encrypting an AV content to be transmitted.