Electronic terminal device protection system

An electronic terminal device protection system, comprising a main computing device in a communication center for providing application software to thereby perform a predetermined service and a user's electronic terminal device for using the service by connecting to the main computing device through a communication network,

• wherein an authentication ID and a hardware address of the terminal device to be used for use of the service are registered on the main computing device in the communication center at the time of subscribing the service;
• the main computing device instructs the electronic terminal device to download electronic tallies of the authentication ID and electronic tally information of the hardware address along with the application software;
• the electronic terminal device sends electronic tallies of the hardware address obtained on the basis of the electronic tally information and the electronic tallies of the authentication ID to the main computing device at the time of use of the service;
• and the main computing device integrates the received electronic tallies of the authentication ID with the stored electronic tallies of the authentication ID to check them and integrates the received electronic tallies of the hardware address with the stored electronic tallies of the hardware address to check them, to thereby verify authenticity of the electronic terminal device to be connected.