CONTENTS DISTRIBUTION SYSTEM, CONTENTS DISTRIBUTION METHOD, DATA PROCESSOR, DATA PROCESSING METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a contents distribution system for distributing encrypted contents which can effectively exclude illegal use of contents. SOLUTION: The system that distributes encrypted contents and allows only legal users to utilize the contents is configured such that a contents management distribution site for distributing contents generates a hash value of data incorporating meta data containing contents cost information and a contents key applied to contents encryption processing and executes an electronic signature, a user site receiving the data acquires the contents key stored in signature object data on the condition that signature verification is established, and the system can prevent illegal use of contents through falsification or replacement of the meta data.