REPRODUCTION MANAGEMENT DEVICE, REPRODUCTION MANAGEMENT METHOD, REPRODUCTION MANAGEMENT PROGRAM, CONTENT RECEPTION SYSTEM AND CONTENT DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a reproduction management device capable of achieving preview with high security at a low cost, and to provide a reproduction management method, a reproduction management program and a content distribution system.;SOLUTION: An IC card (reproduction management device) 3 is a reproduction management device for a receiver receiving a content signal encrypted using a first key Ks updated at a predetermined update period, and a first control signal ECM obtained by encrypting the Ks and the information indicating the renewable time (Tpre) of an encrypted content signal, and includes an interface for receiving the ECM from the receiver, a first decoding section 34 for decoding the ECM and restoring the renewable time (Tpre) of the Ks and the encrypted content signal, and a control section 35 for determining whether or not the Ks is outputted to the receiver, based on the renewable time (Tpre) of the encrypted content signal, and the update period (Tud) of the key, and outputting the restored Ks to the receiver, when a determination is made that the Ks is outputted.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2017,JPO&INPIT