An improved IC card to be inserted in a data processing unit, for communicating data therewith includes: a memory for storing data having a validity term to be transferred to the data processing unit; a timer for determining whether specified time is within the term or not; and a data validity determining...http://www.google.es/patents/US5243175?utm_source=gb-gplus-sharePatente US5243175 - Method and apparatus for determining the validity of data in an integrated circuit card
Method and apparatus for determining the validity of data in an integrated ...
