Accessory apparatus for authenticating articles is used in conjunction with existing readers or scanners of articles bearing stored data, such as credit cards or identification cards. The accessory apparatus is disposed before, after, on, under, inside, or adjacent to existing reader apparatus, to have...http://www.google.fr/patents/US5548106?utm_source=gb-gplus-shareBrevet US5548106 - Methods and apparatus for authenticating data storage articles
Methods and apparatus for authenticating data storage articles
