Patent ID: 6097816
Filing Date: 2000-08-01
Classification: H04N

Abstract:
A method in a crypt key system for decrypting encrypted data for use, by a permit key including a decryption key, comprising a database/charging center, a broadcasting station, a receiving device and a communication device, the method comprising the steps of:said permit key is supplied to said broadcasting station in advance from said database/charging center;said permit key is broadcast from said broadcasting station;said receiving device receives said permit key via said broadcast;a request for use is received by said database/charging center from said communication device;upon receiving said request for use, said database/charging center transmits the encrypted data via a communication line only to said communication device that sent the request for use and charges a fee; andsaid communication device decrypts said encrypted data received via said communication line with said permit key received by said receiving device via said broadcast.