DATA TRANSFER METHOD, DATA TRANSFER METHOD IN CONTENTS SALES SYSTEM UTILIZING THE METHOD AND RECORDING MEDIUM RECORDING DATA

摘要

PROBLEM TO BE SOLVED: To prevent reproduction of real data from being hindered while preventing copying in a sales system for contents data such as music data. SOLUTION: The contents sales system is a system where host serves contents data such a music and transfers (downloads) them to user side players 6a, 6b via a KIOSK installed terminal 5 and a network such as the Internet. A different encryption system is adopted for contents data requiring reproduction in an early timing from that for header information requiring no early timing, the encryption system not taking much time for decoding is adopted for the contents data and a complicated encryption system taking much time for decoding is adopted for the header information storing reproduction key information or the like.