Patent ID: 6247132
Filing Date: 2001-06-12
Classification: G11B,H04L,H04N

Abstract:
A method of controlling the operation of an electronic equipment, comprising the steps of:providing a plurality of electronic equipments connected by way of a bus, said bus allowing for communication of information signals and control signals between each of said electronic equipments;transmitting a control signal of a predetermined format containing predetermined cipher information based upon at least a manufacturer's key information from one of said plurality of electronic equipments to an electronic equipment to be controlled;receiving said control signal by another one of said plurality of electronic equipments;determining whether said predetermined cipher information in said received control signal corresponds to a key cipher information based at least in part upon said manufacturer's key information and retained within said other one of said plurality of electronic equipments; andexecuting an application by said one of said plurality of electronic equipments if said received control signal contains said predetermined cipher information based at least in part upon said manufacturer's key information;wherein the cipher information is prepared at least in part from a key code determined in accordance with each electronic equipment and a cipher function determined on every application; andwherein the transmitting electronic equipment transmits an inquiry key code to said receiving electronic equipment, prepares cipher information based on a key code answered from the equipment to be controlled and a predetermined, internal cipher function, and transmits said cipher information to said electronic equipment to be controlled.