DATA TRANSFER SYSTEM, COMMUNICATION DEVICE, RADIO DEVICE, ILLEGAL COPY PREVENTING METHOD, AND RECORDING MEDIUM WITH PROGRAM RECORDED THEREIN

摘要

PROBLEM TO BE SOLVED: To provide a data transfer system that can correct difference between packet formats. SOLUTION: In the case of transmitting data from an IEEE 1394 device connected to an IEEE 1394 cable 6 to an USB device 7 connected to a USB cable 8, a packet of the IEEE 1394 form transferred from an IEEE 1394 device 5 and identification information to identify the USB device defined by each USB device 7 are inserted into a USB packet and the resulting packet is transferred to the USB to correct a difference between the packet formats thereby applying a DTCP being an illegal copy preventing technology of the IEEE 1394 to the USB.