EP3922474A1 - Procédé de vérification de l'authenticité d'une image imprimée sur un support pour un document de sécurité ou de valeur - Google Patents

Procédé de vérification de l'authenticité d'une image imprimée sur un support pour un document de sécurité ou de valeur Download PDF

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Publication number
EP3922474A1
EP3922474A1 EP21177287.6A EP21177287A EP3922474A1 EP 3922474 A1 EP3922474 A1 EP 3922474A1 EP 21177287 A EP21177287 A EP 21177287A EP 3922474 A1 EP3922474 A1 EP 3922474A1
Authority
EP
European Patent Office
Prior art keywords
image
visible
printed
specific results
contours
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21177287.6A
Other languages
German (de)
English (en)
Inventor
Oliver Muth
Ralf Grieser
Michael Knebel
Franziska Peinze
Ralph Sören Bahro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP3922474A1 publication Critical patent/EP3922474A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/004—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using digital security elements, e.g. information coded on a magnetic thread or strip
    • G07D7/0043—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using digital security elements, e.g. information coded on a magnetic thread or strip using barcodes
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/206—Matching template patterns

Definitions

  • the invention relates to a method for checking the authenticity of an image printed on a carrier for a security or value document and the production of the printed image on the data carrier which is protected against forgery.
  • Security documents such as ID cards or driver's licenses generally have photographs as a security feature.
  • the data from the digital photos are processed using the Raster Imaging Process (RIP).
  • the image visible in the security document is printed with colored inks in the three standardized optimal colors cyan, magenta, yellow and possibly black.
  • photos In order to detect manipulation of the photos, it is customary to provide photos with security features, which can be provided, for example, in a zone in the image to be applied.
  • Security documents are among other things. forged by applying a photo of another person over the photo of the document holder.
  • the photo of the other person can be applied directly, for example, by printing the actual photo directly onto the card surface using an inkjet printing process, or indirectly by first printing on a transfer film and then laminating the image over the actual photo .
  • Particularly good forgeries leave the other security features such as luminescent negative pressure or kinematic holographic structures (Identigram) largely intact, so that the document looks virtually unmanipulated or a little aged.
  • the DE 696 24 400 T2 relates to security documents having a printed image and a compressed digital image encoded in the magnetic medium of the image.
  • the DE 697 11 482 T2 teaches a certificate bearing an image engraved in an engraving film.
  • the DE 10 2006 052 651 A1 relates to a data carrier with a first graphic representation and a second graphic representation, which is better protected against manipulation and is designed as a reference for determining tampering with the first representation, only partial areas of the first and second representation overlapping.
  • the invention is based on the object of specifying a method for recognizing manipulations on the security and value documents.
  • Image-specific results are calculated from the data of a digital image and the visible, printed image or an area of at least one layer of the data carrier above the image is encoded with these results in a detectable form.
  • the visible image itself is coded with the image-specific results or the area of a layer above the image and the coding is detectable, the authenticity of the image can be checked solely on the basis of the image and possibly the layer area of the data carrier above the image.
  • the coding can be visible or invisible in visible light.
  • An invisible coding has the advantage that it is not easily recognizable for the forger.
  • the coding can take place in the visible image at the same time as the printing of the visible image, but also before or after the printing of the visible image.
  • the coding is not in the image itself, but in an area in one or more layers above, ie above the image, i.e. either in an area of a layer of the data carrier between the image and the visible side of the data carrier or in the visible side of the data carrier itself above the image, the image is first printed and then the coding takes place in the area in one or more layers above the image.
  • the image is printed and, independently of this, the coding takes place with the image-specific results of the image in a carrier layer film, which is then positioned and fixed above the image.
  • the image-specific results calculated from the digital image include all possible results determined from the respective portrait, such as the contours of a face, the position of individual, specific points of a face (landmarks) or other support structures analogous to the minutiae in a fingerprint , but also other image-specific results, thus all specific results that can be uniquely calculated from the digital image (in) by calculation using a specific algorithm.
  • the image contours can be calculated from the visible image or light image, for example, with Canny Edge Detection (Canny or Canny Edge algorithm).
  • Canny-Edge (or Canny) -Detection is a robust algorithm for edge detection that is widely used in digital image processing. It is divided into various convolution operations and provides an image which ideally only contains the edges of the original image.
  • contours or support contours based on the algorithm can be extracted from a portrait and output as a separate contour image.
  • Other algorithms can also be used to extract a contour image from the visible image.
  • the image-specific results are calculated using landmarks detection.
  • the positions of individual, specific points on a face are calculated and the calculated landmarks image is then encoded in the printed image, for example by means of transparent luminescent ink.
  • the image-specific results In order to be able to check the correspondence of the visible image with the image-specific results coded in the image, the image-specific results must be detectable. In order to be able to detect, ie observe, recognize, measure or see these image-specific results coded in the image, the image-specific results can be printed in the visible image, in particular by means of a luminescent ink, or in the form of a hologram, barcode or milling or in other ways for example, visually or haptically perceptible or measurable form can be introduced into the layer area above the visible image.
  • the authenticity of an image printed on a data carrier can be checked visually in the case of a visible coding such as a hologram or milling.
  • the image-specific results to be expected can be calculated from the visible image and their correspondence with the image-specific results encoded in the image or in the region of the layer above the image can then be checked.
  • the image is genuine and the image was produced using the method according to the invention.
  • the printed visible image is a forgery because either no image-specific results are encoded in the printed visible image or because the image-specific results encoded in the image do not match the image, for example because the original image was overprinted.
  • the check For a reliable check of the authenticity of the image, if the check is carried out by calculating the expected image-specific results from the visible image, the calculation should be carried out using the same algorithm as the original calculation of the image-specific results from the data of the digital image.
  • the authenticity of the coded visible image is preferably checked in an automated manner.
  • the checking of the coding can also be carried out visually, insofar as it is visible or can be made visible by exposure to electromagnetic radiation, such as UV radiation.
  • the image-specific results which were calculated from image-specific data of the photo, are stored in the image itself or have been introduced into an area of the layer above the image, it can be determined solely by checking the photo and possibly the layer area above the image whether the photo has been manipulated or not, because if the image-specific results stored in the photo do not match the photo, it is a forgery.
  • the authenticity of the document can thus be checked solely by checking the photo as such and, if applicable, the area located above, and preferably in an automated manner, which allows a reliable and quick check.
  • the image-specific results are the image contours or landmarks calculated from the image-specific data.
  • other image-specific results can also be stored in the image.
  • the image-specific results, in particular image contours or landmarks, can be stored in the image in various ways, for example by printing the image contours or the landmarks in the image using luminescent transparent ink, so that the image contours or landmarks are only visible under UV light and thus The correspondence of the image contours or landmarks with the photograph can only be checked under UV light.
  • the image contours can, however, also be provided as a hologram or volume hologram, with a carrier layer film, such as a holographic film, exposed with the image-specific results, in particular the contours, and then applied, glued and sealed to the photograph with a precise fit.
  • a carrier layer film such as a holographic film
  • the image-specific results are removed from a layer area above the image, in particular on the visible side of the data carrier, for example by laser ablation.
  • a data carrier card with a photograph is obtained in which the contours milled into the visible side as tactile depressions in a real document match the contour of the underlying photograph with an exact fit.
  • the data carrier comprises one or more layers made from the following plastics or their derivatives, namely from polycarbonate, bisphenol A polycarbonate, carboxy-modified PC, polyesters such as polyethylene terephthalate (PET), its derivatives such as glycol-modified PET (PETG), carboxy-modified PET , Polyethylene naphthalate (PEN), vinylic polymers such as polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polystyrene (PS), polyvinyl phenol (PVP), polypropylene (PP), polyethylene (PE), polyacrylonitrile butadiene styrene , Polyamides, polyurethanes, polyureas, polyimides or thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU).
  • plastics or their derivatives namely from polycarbonate, bisphenol A polycarbonate, carboxy-modified PC, polyester
  • the image in addition to the visible image, the image also has an invisible luminescent contour image which can be made visible under a UV source and thus the correspondence of the contour image with the visible image can be checked.
  • the visible image is thus overprinted with its own invisible contour image.
  • a contour image is provided via a luminescent dye that is only visible through UV irradiation makes (light) image manipulation visible through film overlay or by overprinting under UV light, since the unambiguous contour calculated using the visually visible original light image and, in particular, its Support structures only match the original photograph. If the photo is manipulated in the visible, the contour would no longer match the manipulated photo and the forgery would be uncovered.
  • the light image can be encoded invisibly using characteristic spatial image elements and thus secured.
  • the contour or landmark image is preferably printed with the luminescent transparent ink together with the printing of the visible image with the colored inks.
  • a further color channel (spot color) for the luminescent ink is provided in the printer so that all inks can be printed at the same time.
  • contour or landmarks image can also first be printed with the luminescent transparent ink and only then can the visible image be printed in the contour or landmarks image or the visible image can be generated first and then the contour or image can be added to the visible image. Landmarks image can be printed.
  • the contour or landmarks image is printed with the luminescent transparent ink on a first carrier layer, for example based on polycarbonate, and the visible image with the colored inks on a second carrier layer, preferably also based on polycarbonate.
  • the carrier layers are then positioned with respect to one another and then joined together, in particular laminated with an increase in temperature and pressure, as in FIG DE 10 2007 052 947 A1 described.
  • all inks can be used as luminescent transparent inks to which the desired dyes which absorb in the UV and which are luminescent and transparent in the visible and which are suitable for printing the respective data carrier have been added.
  • the proportion of the luminescent dye is preferably up to 10% by weight.
  • Such inks contain up to 20% by weight of a binder with a polycarbonate based on a geminally disubstituted dihydroxydiphenylcycloalkane, at least 30% by weight of an organic solvent, up to 10% by weight based on the dry weight of a colorant or colorant mixture and, if applicable, functional materials, Additives and / or auxiliaries.
  • Preferred solvents are hydrocarbons and / or ketones and / or organic esters.
  • inks can be printed on polycarbonate polymer layers with inkjet printers and then laminated to form a composite with impressive optical properties.
  • the colorants or colorant mixtures are luminescent dyes.
  • Luminescent dyes are understood to mean substances that fluoresce, phosphoresce or afterglow.
  • the luminescent dye should not absorb or only absorb very slightly in the visible spectral range.
  • a pure substance or a mixture of luminescent dyes can be used as the luminescent dye.
  • the luminescent dye can be an inorganic or an organic substance, organic luminescent dyes being preferred.
  • the luminescent dye must be excitable with UV radiation and soluble in the respective solvent of the ink.
  • the luminescent dye or dyes can emit in the visible spectral range in different colors such as yellow, red, green, but also in mixed colors or even almost white.
  • composition and, if necessary, concentration ratios of one or more luminescent dyes and their excitation and emission wavelengths special luminescences can also be generated, which can be detected visually under a UV lamp, but also spectroscopically and can represent a further security feature. If several luminescent dyes are provided which differ in their excitation and emission wavelengths, different luminescent colors can also be generated with different excitation wavelengths in the UV.
  • a digital recording of the printed color photo in the security document can be made in order to calculate the contours or landmarks to be expected for the printed image from the digital data of the printed image.
  • the expected contours are then compared with the luminescence contour image or landmarks image of the printed image measured under UV radiation. If the contours match, the photograph is real.
  • the digital recording of the printed image in the security document should under the same conditions as the production of the original digital image , ie under white light, preferably with an RGB camera.
  • the prerequisite for the method according to the invention is therefore that both the calculation of the contour or landmarks image from the original digital image and the calculation of the contour or landmarks image from the recorded printed photo are carried out using the same algorithm and thus under UV Radiation recorded luminescence contour or landmarks image can be compared with the contour or landmarks image calculated from the printed image.
  • the luminescent dye can also absorb the UV radiation underneath the surface of the security document and also below a forged overprinted image and convert it into luminescent light.
  • the contour image produced in the layer of the original image when UV radiation is absorbed by the luminescent dye is visible on the surface of the security document even if the original image is covered by a forged image a large part of the luminescent radiation passes through the layer of the forged image.
  • the method according to the invention can also be applied to other images on security documents or documents of value that are not photographs.
  • Security documents in the form of book-like documents such as passports, for example, comprise, in addition to the laminated data carrier, a book cover and a book block which includes the data carrier.
  • Figure 1 shows the photograph of a document holder "original”, the photograph of another person "overprint” and the falsification of the original by overprinting the photograph of the other person. If the security features of the original remain intact after the falsification, the falsification cannot be recognized.
  • contour image 13 “contour 1” is superimposed with the light image 10 '(image 2), which deviates from image 1, it can be seen, for example, in the chin and eyebrow area that the portrait in image 2 deviates from contour 1.
  • the contour image 13 (contour 1) printed with the luminescent ink 24 is preferably only visible under UV radiation.
  • Figure 3 shows the expanded processing of the image data as part of the personalization of a security or value document 21.
  • the contours of the digital image 10 are extracted by means of the Canny Edge Detection.
  • specific contours or support structures are calculated from the portrait and output as a separate contour image ("Canny contour").
  • This contour image 13 is prepared as a separate color channel (spot color) during printing and simultaneously with the colored colors (cyan, magenta, yellow, core (CMYK)) with transparent luminescent ink 24, which is only visible under UV radiation (“spot”), printed.
  • spot color cyan, magenta, yellow, core (CMYK)
  • the visible light image 15 is recorded with an RGB camera under white light and from this with the Canny Edge method calculates the expected contours 12e.
  • the verification should be done with the same procedure as the image data processing.
  • the document is then excited, for example with UV radiation, for example with a wavelength of 365 nm, and the luminescence image of the contour image 13 is recorded and compared with the image of the calculated expected contours 12e.
  • Correspondences between the measured contour image 13 printed with the luminescent ink 24 and the contours 12e calculated from the RGB image verify the light image 15 or, if they do not correspond, indicate a manipulation.
  • Figure 5 shows on the left-hand side schematically the structure of a data carrier 20 of a security document 21, which consists of several layers 27 and a printed image 15, which are laminated to one another to form a composite.
  • the printed image 15 is located within the layer composite.
  • the area 25 of the layer 27, which extends above or above the image 15 in the direction of the visible side 28, is transparent and thus enables the view of the image 15.
  • the contours 13 (support contours) or landmarks 14 are now precisely fitted into the finished data carrier 20 by means of laser ablation using a suitable laser 40, for example a CO 2 laser (wavelength 10 micrometers) or a CO laser (wavelength 5 micrometers).
  • a suitable laser 40 for example a CO 2 laser (wavelength 10 micrometers) or a CO laser (wavelength 5 micrometers).
  • the result is a data carrier in which the contours 13, 14 are milled precisely above the printed image 15, the contours 13, 14 representing more or less tactile depressions.
  • a holographic film 26, that is to say a carrier layer film 26, is shown on the left-hand side, in which the calculated contours are exposed by means of a laser 40 to produce a hologram 13.
  • the holographic film 26 is then applied precisely to the data carrier 20 above the printed image 15, connected to the data carrier 20 by means of an adhesive layer 29, and the surface is then sealed with a scratch-resistant varnish 30.
  • the result is a data carrier with a photo 15 and precisely fitting holographic contours above the photo 15.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Credit Cards Or The Like (AREA)
EP21177287.6A 2020-06-12 2021-06-02 Procédé de vérification de l'authenticité d'une image imprimée sur un support pour un document de sécurité ou de valeur Pending EP3922474A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020115635.9A DE102020115635A1 (de) 2020-06-12 2020-06-12 Verfahren zur Herstellung eines gedruckten Bildes auf einem Datenträger für ein Sicherheits- oder Wertdokument

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EP3922474A1 true EP3922474A1 (fr) 2021-12-15

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EP21177287.6A Pending EP3922474A1 (fr) 2020-06-12 2021-06-02 Procédé de vérification de l'authenticité d'une image imprimée sur un support pour un document de sécurité ou de valeur

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EP (1) EP3922474A1 (fr)
DE (1) DE102020115635A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022105489B3 (de) * 2022-03-09 2023-03-09 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren zum Bereitstellen eines Druckprodukts und zugehörigen Authentifikations-Informationen und Verfahren zum Authentifizieren eines Druckprodukts

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421619A (en) 1993-12-22 1995-06-06 Drexler Technology Corporation Laser imaged identification card
DE69212596T3 (de) * 1991-03-22 2001-03-08 De La Rue International Ltd., London Artikel
DE69711482T2 (de) 1996-05-17 2002-10-31 E Card Technology Co., Ltd. Verfahren zum Gravieren eines Bildes und Zertifikat enthaltend dieses Bild
DE69624400T2 (de) 1995-04-07 2003-06-12 Eastman Kodak Co., Rochester Verbesserungen der Sicherheit persönlicher Ausweisdokumente durch Speicherung eines digitalen Bildes in einem unsichtbar in einem Bereich des Dokuments aufgebrachten magnetischen Medium
US20030173406A1 (en) 2001-12-24 2003-09-18 Daoshen Bi Covert variable information on identification documents and methods of making same
DE60004529T2 (de) 1999-06-21 2004-02-26 Inksure Ltd. Sicherheitsdokumente mit sichtbaren und unsichtbaren markierungen
DE102006052651A1 (de) 2006-11-08 2008-05-15 Giesecke & Devrient Gmbh Tragbarer Datenträger
DE102007052947A1 (de) 2007-10-31 2009-05-07 Bayer Materialscience Ag Verfahren zur Herstellung eines Polycarbonat-Schichtverbundes
EP2209653B1 (fr) 2007-10-31 2014-04-30 Bundesdruckerei GmbH Composite polymère stratifié pour document de sécurité et/ou de valeur et son procédé de fabrication
DE102014214548A1 (de) * 2014-07-24 2016-01-28 Morpho Cards Gmbh Verfahren zur Herstellung eines Dokuments

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69212596T3 (de) * 1991-03-22 2001-03-08 De La Rue International Ltd., London Artikel
US5421619A (en) 1993-12-22 1995-06-06 Drexler Technology Corporation Laser imaged identification card
DE69624400T2 (de) 1995-04-07 2003-06-12 Eastman Kodak Co., Rochester Verbesserungen der Sicherheit persönlicher Ausweisdokumente durch Speicherung eines digitalen Bildes in einem unsichtbar in einem Bereich des Dokuments aufgebrachten magnetischen Medium
DE69711482T2 (de) 1996-05-17 2002-10-31 E Card Technology Co., Ltd. Verfahren zum Gravieren eines Bildes und Zertifikat enthaltend dieses Bild
DE60004529T2 (de) 1999-06-21 2004-02-26 Inksure Ltd. Sicherheitsdokumente mit sichtbaren und unsichtbaren markierungen
US20030173406A1 (en) 2001-12-24 2003-09-18 Daoshen Bi Covert variable information on identification documents and methods of making same
DE102006052651A1 (de) 2006-11-08 2008-05-15 Giesecke & Devrient Gmbh Tragbarer Datenträger
DE102007052947A1 (de) 2007-10-31 2009-05-07 Bayer Materialscience Ag Verfahren zur Herstellung eines Polycarbonat-Schichtverbundes
EP2209653B1 (fr) 2007-10-31 2014-04-30 Bundesdruckerei GmbH Composite polymère stratifié pour document de sécurité et/ou de valeur et son procédé de fabrication
DE102014214548A1 (de) * 2014-07-24 2016-01-28 Morpho Cards Gmbh Verfahren zur Herstellung eines Dokuments

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