A method for producing a multilayer body, as well as a multilayer body produced thereby. A single- or multi-layered first decorative ply is applied to a carrier ply with a first and a second side. A metal layer is applied to the side of the first decorative ply facing away from the carrier ply and structured such that the metal layer is provided with a first layer thickness in one or more first zones and is provided with a second layer thickness different from the first layer thickness in one or more second zones, wherein in particular the second layer thickness is equal to zero. A single- or multi-layered second decorative ply is applied to the side of the metal layer facing away from the first decorative ply and structured using the metal layer as mask such that the first or second decorative ply is at least partially removed in the first or second zones.

A method for producing a multilayer body, as well as a multilayer body produced thereby. A single- or multi-layered first decorative ply is applied to a carrier ply with a first and a second side. A metal layer is applied to the side of the first decorative ply facing away from the carrier ply and structured such that the metal layer is provided with a first layer thickness in one or more first zones and is provided with a second layer thickness different from the first layer thickness in one or more second zones, wherein in particular the second layer thickness is equal to zero. A single- or multi-layered second decorative ply is applied to the side of the metal layer facing away from the first decorative ply and structured using the metal layer as mask such that the first or second decorative ply is at least partially removed in the first or second zones.

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.

The invention provides an authenticatable ballot and method wherein a printable substrate is provided with at least one of overt authenticating indicia and covert authenticating indicia. The overt and covert authenticating indicia provide a means for voters and ballot counting entities to authenticate ballots by verifying the presence of sanctioned overt and covert authenticating indicia. The overt authenticating indicia is observable by the human eye without the use of any specialized tool or light source. The covert authenticating indicia are not readily apparent to the human eye and require the indicia to be resolved using a specialized tool, such as an ultraviolet or infrared light source.

The invention provides an authenticatable ballot and method wherein a printable substrate is provided with at least one of overt authenticating indicia and covert authenticating indicia. The overt and covert authenticating indicia provide a means for voters and ballot counting entities to authenticate ballots by verifying the presence of sanctioned overt and covert authenticating indicia. The overt authenticating indicia is observable by the human eye without the use of any specialized tool or light source. The covert authenticating indicia are not readily apparent to the human eye and require the indicia to be resolved using a specialized tool, such as an ultraviolet or infrared light source.

A method for marking a product (1) with a photoluminescent mark, said mark comprising a photoluminescent portion (10) which is transparent under normal light conditions and revealed by photoluminescence under UV illumination, said mark further comprising a non photoluminescent portion (9) which is transparent under normal light conditions as well as under UV illumination, said method comprising: deposing on said product a stack, said stack comprising alternatively layers (2, 4), such as AlN, with a thickness of less than 1 micron and layers (3) of a second material, such as GaN, with a thickness of less than 10 nm; raising the transparency of said non photoluminescent portion (10) with a deposition of transparent material (6) or incorporation of ions into said non photoluminescent portions.

A method for marking a product (1) with a photoluminescent mark, said mark comprising a photoluminescent portion (10) which is transparent under normal light conditions and revealed by photoluminescence under UV illumination, said mark further comprising a non photoluminescent portion (9) which is transparent under normal light conditions as well as under UV illumination, said method comprising: deposing on said product a stack, said stack comprising alternatively layers (2, 4), such as AlN, with a thickness of less than 1 micron and layers (3) of a second material, such as GaN, with a thickness of less than 10 nm; raising the transparency of said non photoluminescent portion (10) with a deposition of transparent material (6) or incorporation of ions into said non photoluminescent portions.

A security feature, which is made up of a security device that is coupled to machine detectable indicia, is provided. The security feature may be used with a banknote, with the security feature serving to authenticate the banknote. Harvesting the security device will disturb the machine readable effect or signal generated by the machine detectable indicia, thereby allowing detection of the harvesting.

An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UV-wavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.

An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UV-wavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.