A personalizable security document (10) includes a security feature (3b) including a combination of a plurality of different features. In particular, the security feature (3b) may include a laser-engraved image in a first layer (16), and one or more fluorescent inks (7a, 7b) in further layers (27a, 27b), which are disposed below the first layer. Optionally, a watermark (8) may also be provided in a lower layer (18). A laser-engraving of the image is performed from a first side (S1) of the substrate (1) such that patterns formed by the inks (7a, 7b) are not affected. Under white light, the laser-engraved image can be viewed from the first side of the substrate, whereas multi-color fluorescence of the patterns can be observed from the second side (S2) under UV light.

A personalizable security document (10) includes a security feature (3b) including a combination of a plurality of different features. In particular, the security feature (3b) may include a laser-engraved image in a first layer (16), and one or more fluorescent inks (7a, 7b) in further layers (27a, 27b), which are disposed below the first layer. Optionally, a watermark (8) may also be provided in a lower layer (18). A laser-engraving of the image is performed from a first side (S1) of the substrate (1) such that patterns formed by the inks (7a, 7b) are not affected. Under white light, the laser-engraved image can be viewed from the first side of the substrate, whereas multi-color fluorescence of the patterns can be observed from the second side (S2) under UV light.

In a general aspect, unique unclonable physical identifiers are applied and used. A method of applying the unique marker can include receiving an object having a surface feature and forming a unique marker on the surface feature of the object. The unique marker includes a distribution of elements and conforms with a morphology of the surface feature. The method further includes extracting orientation information from the unique marker. The orientation information can indicate relative spatial orientations of the respective elements. The method additionally includes generating a unique code for the object based on the orientation information. The surface feature can be facets, surface patterns, textures, or other indentations of the object. The surface feature can include a region of the object that is susceptible to tampering.

In a general aspect, unique unclonable physical identifiers are applied and used. A method of applying the unique marker can include receiving an object having a surface feature and forming a unique marker on the surface feature of the object. The unique marker includes a distribution of elements and conforms with a morphology of the surface feature. The method further includes extracting orientation information from the unique marker. The orientation information can indicate relative spatial orientations of the respective elements. The method additionally includes generating a unique code for the object based on the orientation information. The surface feature can be facets, surface patterns, textures, or other indentations of the object. The surface feature can include a region of the object that is susceptible to tampering.

A method for producing a data carrier includes a luminescent security element having at least two subregions, which at least do not completely overlap one another.

A method for producing a data carrier includes a luminescent security element having at least two subregions, which at least do not completely overlap one another.

Methods and systems for configuring and rendering a fluorescent watermark can involve modifying a non-partially reflecting/absorbing ultraviolet ink from an original ultraviolet pattern by blending a minimal amount of a partially reflecting ink, and ensuring that the modification of the non-partially reflecting/absorbing ultraviolet ink maintains an appearance of two or more pattern inks as a single color/pattern under office lighting when rendered as a part of a fluorescent watermark based on the non-partially reflecting/absorbing ultraviolet ink. The fluorescent watermark can be then rendered on a substrate (e.g., paper or other material).

A secure device for securing an article that includes at least one connection element, at least one data carrier, and at least one security element. The connection element is configured to be connected to the article, and the data carrier is in connection with the connection element and is configured to be connected to the article via the connection element. The connection element is configured to interact with impinging electromagnetic radiation such, that at least one marking element is generated in the connection element upon the impingement of the electromagnetic radiation. The data carrier is configured to interact with impinging electromagnetic radiation such, that at least one further marking element is generated in the data carrier upon the impingement of the electromagnetic radiation. The security element comprises or consists of the marking element of the connection element and of the further marking element of the data carrier.

A secure device for securing an article that includes at least one connection element, at least one data carrier, and at least one security element. The connection element is configured to be connected to the article, and the data carrier is in connection with the connection element and is configured to be connected to the article via the connection element. The connection element is configured to interact with impinging electromagnetic radiation such, that at least one marking element is generated in the connection element upon the impingement of the electromagnetic radiation. The data carrier is configured to interact with impinging electromagnetic radiation such, that at least one further marking element is generated in the data carrier upon the impingement of the electromagnetic radiation. The security element comprises or consists of the marking element of the connection element and of the further marking element of the data carrier.

Techniques for manufacturing a light field print using a printing press. The techniques include: identifying at least one characteristic of the printing press at least in part by printing at least one calibration pattern; obtaining content to be rendered using the light field print, the content comprising multiple scene views; generating, based at least in part on the content and the at least one characteristic of the printing press, a front target pattern and a back target pattern; and using the printing press to: print the front target pattern on a first side of a substrate; and print the back target pattern on a second side of the substrate.