Security printing of cards and the like

Details Security printing of cards and the like Security printing of cards and the like

B - Operations, Transporting

42

D

B42D 15/00 (2006.01) A63F 3/06 (2006.01)

Patent

CA 2333454

A printed item such as a telephone card (10) carrying a credit code which is concealed by scratch off material which is irreversibly removed to use the card, wherein the scratch off material is overprinted with a layer which is an "active" layer (18) in that it exhibits a changing characteristic under particular conditions to enhance the security of the card against compromise.

L'invention concerne un article imprimé, par exemple une carte téléphonique (10), portant un code d'utilisation caché par un matériau à gratter, que l'on doit retirer définitivement pour pouvoir utiliser la carte. Ce matériau à gratter est recouvert d'une couche (18) qui est "active", dans la mesure où la caractéristique de cette couche varie dans des conditions particulières afin d'améliorer la sécurité de ladite carte et de protéger celle-ci contre toute compromission.

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