Abstract: A security document has a first region and an adjacent second region, the regions defining a security device. Opposite sides of the first region are provided with first and second, complementary indicia registered with respect to one another, the first region being sufficiently transparent that both the first and second indicia are viewable from either side of the document under reflected light. Third indicia are provided on the second region on the same side of the document, registered with, and complementary to, the first indicia, and fourth indicia are provided on the second region on the same side of the document, registered with, and complementary to, the second indicia, the third and fourth indicia also being complementary to and registered with respect to one another.

Abstract: A security device having one or more printed or transferred first areas, each first area having one or more first colors; and one or more printed or transferred second areas, each second area having one or more second colors. At least one of the first an second areas has a discontinuous pattern, and the first area or areas surrounds the second area or areas, each first area being distinguishable from the second area or areas. The first area(s) and/or second area(s) define an image. A camouflage pattern is provided over the image and at least an adjacent region surrounding the image, the camouflage pattern having a color and pattern such that in combination with the first and second areas, it renders the image substantially invisible when viewed under reflected light but visible when viewed in transmission.

Abstract: A security document has a first region and an adjacent second region, the regions defining a security device. Opposite sides of the first region are provided with first and second, complementary indicia registered with respect to one another, the first region being sufficiently transparent that both the first and second indicia are viewable from either side of the document under reflected light. Third indicia are provided on the second region on the same side of the document, registered with, and complementary to, the first indicia, and fourth indicia are provided on the second region on the same side of the document, registered with, and complementary to, the second indicia, the third and fourth indicia also being complementary to and registered with respect to one another.