content: Actually your wrong.   At point of sale, they have it on a RFID Reader to disable the alarms.   You sell the product, and the RFID signature is now associated with your credit card number, which is associated with your name.   As you enter a store with an RFID Anti-Theft system, your name is registered.   They sell the Names of people associated with RFIDs.    They can track your shopping habits quite easily.