DELIVERY SYSTEM FOR CONTENTS AND ITS RECEIVIN DEVICE, DELIVERY DEVICE, MACHINE-READABLE MEDIUM RECORDED WITH ITS RECEPTION PROGRAM AND MACHINE-READABLE MEDIUM RECORDED ITS DELIVERY PROGRAM

摘要

PROBLEM TO BE SOLVED: To protect against unauthorized removal of digital contents at reading in rotation of users, using mobile terminals at public facility or the like. SOLUTION: In a contents delivery system 3 comprising a contents delivery device 1 delivering contents 5 and a contents receiver 2 receiving and reproducing the delivered contents 5, the device 1 delivers a signal to continuously reproduce the contents 5 at every by each prescribed time period, and when this signal is not received for the prescribed time period, the receiver 2 can no longer reproduce the contents 5.