Abstract: A security device includes an optically variable device (OVD) having diffraction-based micro-optics including at least one moiré magnified visual representation of a micro-object. A diffractive structure provides micro-objects with unique optical effects when the OVD is viewed through the micro-object structure from a predetermined relative observation point. In addition to magnifying the micro-objects, the diffractive structure can impart optical effects such as change in observed color, enhanced contrast, animation of the observed visual representation, and change in size or shape of the observed visual representation. The micro-objects and the diffractive structure can be disposed on the same or different portions of a substrate. A method of making OVDs, and an article employing such OVDs are also disclosed.

Abstract: Optical elements include an optical grating structure which exhibits novel pleochroic properties when rotated or viewed from changing observation locations. The optical grating structure is formed from a plurality of selectively arranged grating elements which are preferably, but not necessarily, formed from a plurality of lines or grooves having a closed-loop shape. The preferred closed-loop lines and grooves are disposed one inside another and preferably include at least one common axis of symmetry. A two-dimensional array of such elements is arranged to define an optically variable device. A method of creating elements, arrays and optically variable devices and articles employing the same are also disclosed.

Abstract: A security label including a label liner having a first adhesive layer and a piggy-back label removably secured to the liner by a second adhesive layer. An associated package having the security label placed thereon, as well as associated methods are also disclosed.

Abstract: A method of protecting an informational article including providing an informational article substrate having a zone for inserting variable information and a refractive image disposed within the zone, inserting the information in the zone so that at least a portion of the information is over the image, and securing a transparent tape having a write-resistant exposed surface over the information. The image resist photocopy duplication of the article and the write-resistant exposed surface resist alteration of the information.

Abstract: The tamperproof window securable informational article includes a first side for facing said window and a second side for facing away from said window. A low wet-strength paper layer which will resist removal of said article as a unit when the paper layer has been soaked with a liquid is provided. Standard information and custom information may be interposed between an adhesive layer for securing the article to the window and an optically variable device. A first partially liquid permeable layer is disposed rearwardly of the low wet-strength paper layer. In a preferred embodiment the optically variable device is a hologram and zones of different adhesive and release properties are interposed between the optically variable device and the paper layer to resist removal of the article as a unit.