CONTENTS DELIVERY METHOD AND CONTENTS DECRYPTION METHOD AND SYSTEM FOR THEM

摘要

PROBLEM TO BE SOLVED: To provide a contents delivery method and a contents decryption method which make it possible to prevent contents from being regenerated even if the contents itself is illegally copied. SOLUTION: A code for encrypted contents 101 is decrypted and the contents is regenerated if a contents identifier in a license key 131 matches with a contents identifier 102 attached to contents 103 to be delivered and if a portable terminal identifier in the license key matches with the portable terminal identifier attached in advance to a portable terminal 124.