CONTENTS PROVIDING APPARATUS AND METHOD AND CONTENTS USING APPARATUS AND METHOD FOR CHECKING INTEGRITY OF CONTENTS, AND CONTENTS PROVIDING APPARATUS AND METHOD FOR REVOCATING CONTENTS USING APPARATUS

摘要

This invention is provided to abolish a contents use apparatus without having right authority with a value produced in an authentication process between a contents providing apparatus and the contents use apparatus, thereby providing contents to only the contents use apparatus having right authority even when there is no certificate authority. An integrity confirmation key is produced in each packet to confirm the integrity of contents comprising at least one packet by using information included to the packet. A group, a secret set, comprising the integrity confirmation key produced in each packet is produced(S610). The secret set is packaged with the contents and a transfer packet is produced (S620). The transfer packet is transmitted(S630).