Security can be built in to any machine fairly cheap ... It is called "Spread Spectrum". No, I can not explain it, but it works.... You can have millions of seeds in a chip and randomly choose (transmit) the one you want for the next x cycles and if hack does not have the codes, he gets nothing - and the chips do not duplicate on a copier.... and can be updated by cellular phone data - Customer does not subscribe, provider does! More than one reponse from serial (phone) number -- Cancel service on that number!