What information is stored on RFID tags?

The tags most companies are planning to use in the supply chain in the short term and in consumer packaging in the long term will contain only an Electronic Product Code. The EPC will be associated with data in online databases. Some information about the item might be accessible to anyone-such as what the product is-but other information, such as where it was made and when-will be accessible only to those whom the manufacturer wants to make the information available to. So Wal-Mart will not have access to data about products sold by Target and vice versa.