Systems, devices, methods, and instructions for travel document validation, including receiving data for one or more travel documents, generating a set of features for artificial intelligence model training, validating, and testing, upon receiving data for a plurality of travel documents, data from a first subset of travel documents is used to train an artificial intelligence model, a second subset of travel documents is used to validate the artificial intelligence model, and a third subset of travel documents is used to test the artificial intelligence model.

A multipage security document has a first verification lens located in a see-through portion and corresponding to a first verification feature and a second verification lens collocated with the first verification lens as an adjacent layer to the first verification lens in the see-through portion and corresponding to a second verification feature. The multipage security document can contain a first sheet and a second sheet connected along one side to the first sheet such that the second sheet may be placed against the first sheet, the second sheet having a see-through portion. Other embodiments are disclosed.

A multipage security document has a first verification lens located in a see-through portion and corresponding to a first verification feature and a second verification lens collocated with the first verification lens as an adjacent layer to the first verification lens in the see-through portion and corresponding to a second verification feature. The multipage security document can contain a first sheet and a second sheet connected along one side to the first sheet such that the second sheet may be placed against the first sheet, the second sheet having a see-through portion. Other embodiments are disclosed.

The present invention relates to a layer structure, preferably a hinge, particularly preferably a book cover, very particularly preferably a book cover for identification and security documents, comprising at least one outer layer a) containing at least one thermoplastic elastomer, preferably a thermoplastic polyurethane, and at least one layer b) containing at least one material selected from the group consisting of a polymer, a metal, a textile, a paper and a synthetic paper, or a combination of at least two of these, and also relates to a laminate comprising the above layer structure and to the method for producing same. The invention further relates to the use of the layer structure and/or laminate for the production of a hinge, preferably a multilayer book cover, especially for security and identification documents.

An optical anti-counterfeiting element and manufacturing methods of the optical anti-counterfeiting element are provided. The optical anti-counterfeiting element includes an undulating structure layer provided with a first area, a second area and a third area; the first area has a first microstructure; the second area has a second microstructure; the third area is an unstructured flat area; a specific volume of the second microstructure is greater than a specific volume of the first microstructure; the first area and the third area are respectively provided with a reflecting layer, a dielectric layer and an absorbing layer which are overlapped, and the second area is not provided with a reflecting layer; and a surface appearance of one side, far away from the undulating structure layer, of the dielectric layer of the first area is obviously different from a surface appearance of the undulating structure layer.

A device for verifying a machine-readable security feature of a document of value, having: a transport device configured to transport the document on a transport plane, a radiation emitter that is arranged on a first flat side and emits radiation in the direction towards the first flat side, a sensor that is arranged on the first flat side and is configured to receive at least part of the luminescent radiation, a reflector arranged and configured on the second flat side-so as to at least partly reflect the luminescent radiation of the security feature of the document of value to the sensor, and an evaluation unit.

A security element with one or more first microstructures, wherein the first microstructures are provided in each case in one or more tracks which are curved at least in sections or in one or more sections of a track which are curved at least in sections, and/or in each case run along one or more tracks which are curved at least in sections or along one or more sections of a track which are curved at least in sections, and a method, wherein at least one file containing image points of one or more image elements is provided, which includes the locational arrangement of the image points, and one or more tracks which are curved at least in sections or one or more sections of one or more tracks which are curved at least in sections are determined from the locational arrangement of the image points, and in the one or more tracks or sections of tracks in each case one or more first microstructures are provided which, when illuminated, provide a first item of optically variable information.

An optically variable security arrangement for securing valuable articles, comprises a first sub-element having a two-dimensional relief grid composed of a plurality of grid elements and that has, in at least one spatial direction R.sub.1, a first line screen p below 500 μm, and in which the grid elements are each formed from at least two relief elements that are directionally reflective in different directions, and a second sub-element having at least one dot and/or line grid that, in a spatial direction R.sub.2, has a second line screen q. A movement effect is created by the interplay of the relief grid and the dot and/or line grid when the security arrangement is tilted.

A security device is disclosed including a substrate and one or more focusing elements or lens structures located on one side of the substrate. The security device includes a plurality of image elements associated with each focusing element wherein the image elements include at least first and second groups of image elements. Each image element may be composed of pixels located in an object plane to be viewable through the associated focusing element. Each image element comprises a diffractive grating element or sub-wavelength grating element which when illuminated by a light source generates a diffraction image observable at a range of viewing angles around the device. Image elements of the first group are visible in a first range of viewing angles and image elements of the second group are visible in a second range of viewing angles. The security device is particularly suitable for use on security documents, such as banknotes. A method of forming a security device is also disclosed.

A security device is disclosed including a substrate and one or more focusing elements or lens structures located on one side of the substrate. The security device includes a plurality of image elements associated with each focusing element wherein the image elements include at least first and second groups of image elements. Each image element may be composed of pixels located in an object plane to be viewable through the associated focusing element. Each image element comprises a diffractive grating element or sub-wavelength grating element which when illuminated by a light source generates a diffraction image observable at a range of viewing angles around the device. Image elements of the first group are visible in a first range of viewing angles and image elements of the second group are visible in a second range of viewing angles. The security device is particularly suitable for use on security documents, such as banknotes. A method of forming a security device is also disclosed.