1. A method of producing a security document, comprising: providing a specific security document having a document surface with first information unique to the specific security document formed thereon; dividing the first information into a plurality of segments, each segment based on a different portion of the first information; and for each segment, forming a diffraction grating layer, each diffraction grating layer having an axis of diffraction that is different from the other diffraction grating layers to form a multi-layered diffractive optically variable image device on the security document, and printing the diffractive optically variable image device on the document surface.