Methods and systems for a financial card with dynamic viewing angles are disclosed. A first portion of indicia and a second portion of indicia can be disposed on a first surface and/or a second surface of a financial card. The first portion of the indicia can be viewable only from at least a first viewing angle. The second portion of the indicia can be viewable only from at least a second viewing angle, the second viewing angle being different from the first viewing angle.

Methods and systems for a financial card with dynamic viewing angles are disclosed. A first portion of indicia and a second portion of indicia can be disposed on a first surface and/or a second surface of a financial card. The first portion of the indicia can be viewable only from at least a first viewing angle. The second portion of the indicia can be viewable only from at least a second viewing angle, the second viewing angle being different from the first viewing angle.

A security element (1) for a security paper, value document or the like, having a carrier (8) which has an areal region (3) which is divided into a multiplicity of pixels (4) which respectively includes at least one optically active facet (5), whereby the majority of the pixels (4) respectively have several of the optically active facets (5) of identical orientation per pixel (4), and the facets (5) are so oriented that the areal region (3) is perceptible to a viewer as an area that protrudes and/or recedes relative to its actual spatial form.

This patent document discloses physical documents including metameric ink pairs. One claim recites a document comprising: a first surface; a second surface, in which the first surface comprises a first set of print structures and a second set of print structures, in which the first set of print structures and the second set of print structures collective convey an encoded signal discernable from optical scan data representing at least a first portion of the first surface, in which the first set of print structures is provided on the first surface with a first ink and the second set of print structures is provided on the first surface with a second, different ink, and in which the first ink and the second, different ink comprise a metameric pair. Of course, other claims and combinations are described as well.

This patent document discloses physical documents including metameric ink pairs. One claim recites a document comprising: a first surface; a second surface, in which the first surface comprises a first set of print structures and a second set of print structures, in which the first set of print structures and the second set of print structures collective convey an encoded signal discernable from optical scan data representing at least a first portion of the first surface, in which the first set of print structures is provided on the first surface with a first ink and the second set of print structures is provided on the first surface with a second, different ink, and in which the first ink and the second, different ink comprise a metameric pair. Of course, other claims and combinations are described as well.

A 3D physical unclonable functions (PUF) system produced based on harnessing the out-of-plane crumpling of a layer of 2D material during shrinkage of a substrate carrying such layer. The structural details of the so-formed 3D PUF pattern are extracted from the tags in a layer-by-layer fashion using confocal laser microscopy imaging and then reconstructed to form the 3D PUF keys and stored in the database, serving as a secure anti-counterfeiting PUF that demonstrates encoding capacity in excess of 10.sup.40,000,000. Authentication is performed with a customized trained Siamese neural network framework in a matter of few minutes in a fashion that does not depend on rotation, linear translation, tilt, variations of contrast and/or resolution of the extracted optical images.

A business form comprises a first portion and a second portion adhesively secured to the first portion via a control bond adhesive. The control bond adhesive is a mixture comprising: between about 1 kg and 2 kg of a flexible adhesive; between about 1 kg and 2 kg of water; between about 12 g and 16 g gypsum, and between about 13 g and 23 g fumed silica.

A business form comprises a first portion and a second portion adhesively secured to the first portion via a control bond adhesive. The control bond adhesive is a mixture comprising: between about 1 kg and 2 kg of a flexible adhesive; between about 1 kg and 2 kg of water; between about 12 g and 16 g gypsum, and between about 13 g and 23 g fumed silica.

A packaged redeemable code system is disclosed. The packaged redeemable code system includes a paper insert having a front surface with a removable item, and a rear surface with redeemable code. The packaged redeemable code system further includes a paper sleeve having an interior that encloses the paper insert and conceals the redeemable code. The paper sleeve also having a ripcord configured to open an edge of the paper sleeve to provide an access point for removal of the paper insert. The paper sleeve further having a front surface with a cutout extending therethrough. The cutout aligns with and provides visual access to the removable item. The removable item is a different color than or provides contrast with the front surface of the paper sleeve. The paper sleeve further having a rear surface with an activation code that is associated with the redeemable code.