The invention is a replacement printed circuit board or chip that allows a printer to utilize a replacement printer cartridge. The printed circuit board has an encrypted memory device and a microcontroller, wherein the microcontroller is programmed to intercept the request from the printer for the unique lot number data and to provide the appropriate unique lot number data to the printer in response to the request. The encrypted memory device is programmed just like the custom original equipment manufacturer encrypted memory device, and, with the exception of providing the unique lot number data to the printer, communicates with the printer just as the original equipment manufacturer encrypted memory device would.