SECURITY ELEMENT TO PREVENT COPYING OF PROTECTED DOCUMENTS

摘要

The invention concerns a protected document (1) such as a bank note, identity card or the like, with a security element (2) in the form of a band or strip which is subdivided into adjacent subsections in which diffraction structures are incorporated. The diffraction structures represent very reduced data. Data in individual sections can be read from different angles of view in such a way that when the angle of view is changed the optical data in various sections can be read in sequence, which creates the effect of movement along the length of security element (2).