A method and system for protecting product information stored in a wireless tag. The product information relates to a product and includes a unique identifier that is unique to the product. The product information is received from the tag. A local identifier is generated according to a predetermined rule such that the received product information corresponds to the local identifier. The local identifier is not unique to the product. The received product information is sent to a product information recording medium physically separated from the tag in order to store the received product information in the product information recording medium. The local identifier is sent to the tag and replaces the product information stored in the tag.