PROTECTS AGAINST COPYRIGHT DOCUMENT AND METHOD FOR OBTAINING SUCH A DOCUMENT.

摘要

The invention relates to a document protected against reproduction and a method for obtaining such a document. The following document the invention prevents obtaining a faithful copy, especially when using a color photocopier. The document includes an interference résearu, obtained for example by interfering with holography unfaisceau directed light to cause the appearance of spots on any attempt to copy the original document.