DELIVERY SERVER, COMMUNICATION TERMINAL, SECOND COMMUNICATION TERMINAL AND MEMORY MEDIUM STORING SERVER PROCESSING PROGRAM, MEMORY MEDIUM STORING TERMINAL PROCESSING PROGRAM, AND MEMORY MEDIUM STORING SECOND TERMINAL PROCESSING PROGRAM

摘要

PROBLEM TO BE SOLVED: To set a delivery cost low for purchase by a lot of users by preventing the reuse by illegal copying in a delivery service system for purchase of the data of sound and image through a communication network for reproduction. SOLUTION: When a request for delivery of the content data such as a music and an image to a specified portable telephone is sent from a portable telephone terminal 20 to a delivery server device 10, the delivery server device 10 adds the copying preventing noise (copying preventing information) using a portable telephone number of a requesting user as a key to the requested content data, and delivers the content data to be utilized by the only portable telephone terminal 20. A discount inexpensive charge can be set in comparison with a normal charge in the case of delivering the content data without adding the copying preventing information for general utilization, and purchase by a lot of users is propelled.