System, device and method for terminal product usable time management

A terminal product usable time management method, adapted to a terminal product usable time management device including a data memory, a microprocessor, and at least one communication port of a product controller;

• the method comprising:
• using a customer service software of a remote server to generate, encrypt and send a new expiry date to a local apparatus;
• using the data memory to store an identifier and a usable time or an expiry date of the terminal product, wherein the usable time or the expiry date has been encrypted into an encrypted usable time or an encrypted expiry date;
• connecting the at least one communication port to at least one external device, in order to receive the new expiry date used to update the usable time or the expiry date stored in the data memory;
• using the microprocessor to read the encrypted usable time or the encrypted expiry date stored in the data memory, decrypt the encrypted usable time or the encrypted expiry date into the usable time or the expiry date, decrease the usable time per time unit into a decreased usable time or compare today's date with the expiry date, encrypt the decreased usable time into an encrypted and decreased usable time or encrypt the expiry date into the encrypted expiry date, store the encrypted and decreased usable time or the encrypted expiry date into the data memory, and instruct the product controller to disable some or all functions of the terminal product, if the usable time read by the microprocessor is inaccessible or decreased to zero, or today's date reaches the expiry date read by the microprocessor.