A personal card and method of transaction validation for the protection of credit card use in malls, restaurants, telephone and Internet orders and use of ATM. The card generates a coded validation number based on a time code, a cardholder's PIN, and the amount of purchase in accordance with a unique...http://www.google.es/patents/US7543741?utm_source=gb-gplus-sharePatente US7543741 - System, method and program product for credit card transaction validation
System, method and program product for credit card transaction validation
