Christoph Heckenkamp

Data carrier having an optically variable element and methods for producing it

Record carrier with an optical variable element and method of producing it

Datentrager mit einem optisch variablen element

Document with an unforgeable surface

Machine readable data carrier with optically variable element

Document with reliefs against falsification, and method for manufacturing the same

Method of producing a document with an unforgeable surface relief

Optically variable element with non-holographic data and its production method

Record carrier with an optical variable element

Data carrier having optically variable element and method for producing the same