A document includes at least one drawing or data produced, for example, by printing. In addition, this document includes a hologram representing part of the document. The hologram of this document is recorded using a system including a prerecorded or electrically controllable optical modulator in which...http://www.google.fr/patents/US6980336?utm_source=gb-gplus-shareBrevet US6980336 - Secured document, system for manufacturing same and system for reading this document
Secured document, system for manufacturing same and system for reading this ...
