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WO2000045344A1 - Substrats pour impression - Google Patents

Substrats pour impression Download PDF

Info

Publication number
WO2000045344A1
WO2000045344A1 PCT/GB2000/000129 GB0000129W WO0045344A1 WO 2000045344 A1 WO2000045344 A1 WO 2000045344A1 GB 0000129 W GB0000129 W GB 0000129W WO 0045344 A1 WO0045344 A1 WO 0045344A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
feamres
document
substrate according
printed
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.)
Ceased
Application number
PCT/GB2000/000129
Other languages
English (en)
Inventor
Robert John Furley
Robert George Stone
Paul Van Braeckel
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.)
Governor and Co of Bank of England
Original Assignee
Governor and Co of Bank of England
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10846407&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000045344(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to EP00900703A priority Critical patent/EP1147495B1/fr
Priority to DE60001098T priority patent/DE60001098D1/de
Priority to JP2000596532A priority patent/JP2002536202A/ja
Priority to CA002357727A priority patent/CA2357727A1/fr
Priority to HK02103076.9A priority patent/HK1043417A1/zh
Application filed by Governor and Co of Bank of England filed Critical Governor and Co of Bank of England
Priority to AU30631/00A priority patent/AU3063100A/en
Priority to AT00900703T priority patent/ATE230510T1/de
Priority to MXPA01007401A priority patent/MXPA01007401A/es
Publication of WO2000045344A1 publication Critical patent/WO2000045344A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10—Watermarks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • 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
    • G07D7/005—Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
    • 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

  • This invention concerns substrates, primarily papers and in particular to a method of modifying the substrate to make it suitable for use in printing security documents.
  • Methods are known for modifying substrates so that genuine substrates can be identified and distinguished from counterfeit substrates.
  • these methods include marking the genuine substrate with materials which fluoresce under ultra-violet, or which only emit light at some special region of the visible spectrum, or involve the addition of special material such as magnetic materials or infra-red absorbing pigments, or the inclusion of large scale water marking in pictorial or bar code form on or in the substrate. All these methods require either a gross alteration of the substrate (as in watermarking methods) or the inclusion of special materials usually requiring special detectors to determine if the substrate of any document is genuine. Such methods tend to be expensive, the effects are usually readily visible to the naked eye, and it is not impossible to modify paper and other substrates in a similar manner, so as to confuse a verification process.
  • the features will not normally be reproduced by a copier or printer supplied with image data signals obtained from an unprotected such system, as it can be arranged that if the computer system or copier detects the said features it can therefore refuse to process the image.
  • the contrast between the features and the remainder of the substrate surface is selected so that image data signals corresponding to the features are substantially indistinguishable from image data signals relating to the remainder of the substrate surface and/or from background noise signals in the output of the photoelectric device and are thereby indistinguishable by eye;
  • the features are repeated at intervals over at least some of the surface area of the substrate, whereby time or position of signals relating to each feature will bear at least one fixed relationship to signals relating to other of said features, whereby a computing device supplied with the image data signals can be programmed to identify whether feature signals bearing the said at least one fixed relationship are present in the data, to assist in identifying the imaged document.
  • the feamres may be repeated at regular intervals.
  • Each of the physical feamres may be similar in character to each of the other feamres in the said surface.
  • Documents of the same type may be printed on substrate bearing similar feamres having a similar fixed relationship over the surface of the substrate.
  • bank notes of one denomination may be printed on a substrate having surface feamres of a particular type and one or more particular spacings.
  • the spacing may be selected so as to be constant in one direction only or varied according to a special, known pattern.
  • a similar or different regular spacing may be selected for feamres in another direction bearing a particular spacial relationship relative to the first said direction, for example perpendicular to the said first direction.
  • the features are arranged in a 2D matrix in the substrate surface.
  • feamres in a substrate surface constitutes a primary encoding of the substrate allowing substrates to be distinguished from substrates not containing said feamres, or to be distinguished one from another depending on the choice of feamres.
  • Secondary encoding of a substrate may be achieved by introducing a variation into the matrix such as by omitting feamres from particular positions in such a regular matrix.
  • every fourth feature along each third line may be omitted.
  • security documents are encoded using both primary and secondary encodings.
  • secondary encoding may be provided if the matrix is formed from feamres having two distinctive characteristic and, instead of omitting feamres at specific positions within the matrix, feamres of one type are located at one set of positions in the matrix, and feamres of the other type are located at other positions in the matrix.
  • one set of feamres may be generally circular in shape, whereas interspersed feamres producing a secondary encoding may have a different readily distinguishable shape such as rectangular or triangular.
  • the encoding of a substrate can be achieved by selecting the spacing between feamres or selecting feamres having a specific characteristic such as shape which can be identified in image data signals relating thereto, and/ or by the substitution of feamres having a first characteristic at selected points in a regularly occurring matrix of such feamres by other feamres having a second different characteristic, and/or the omission of feamres at particular points in a matrix, there is an almost infinite number of possible combinations and permutations available to encode security document substrates.
  • each individual type of security document such as banknotes of different denominations, cheques originating from different banks, passports issued by different offices, and the like, if desired can be uniquely identified by a particular primary and/or secondary encoding selected for the substrate on which they are to be printed.
  • Image analysis techniques for identifying the presence of regularly occurring patterns and/or drop-outs within regularly occurring patterns and/or shape(s) or other visibly distinguishable feamres of detectable features in an image, are readily available and known, and by using high speed processors such as DSPs and the like, image data can be checked and verified or otherwise, virtually instantaneously as documents are scanned.
  • a physical feature is selected for encoding the surface of a substrate to provide a primary encoding, which will not appear in the electrostatic image of a photocopier. This ensures that attempts to reproduce the original by photocopying will merely produce a copy containing the printed content of the document unless the substrate onto which it is copied contains the correct physical encoding in the surface thereof. More preferably, if a secondary encoding is present, any variation in the primary encoding which constitutes the secondary encoding is even less capable of being distinguished by the naked eye or picked up by a photosensitive device as used in a photocopier.
  • the physical feature encoding is in the form of a repeat pattern.
  • the identification feamres are such that the appearance of the security document (for example a bank note) is not affected or dismrbed aesthetically, since in the case of banknotes, the introduction of new notes provided on substrate according to the invention is permissable alongside existing banknotes printed on unencoded substrate, since if the general appearance of the documents is unchanged to the naked eye, old but nevertheless authentic notes which do not contain the physical feature encoding on the substrate surface provided by the invention, will appear similar to banknotes printed on encoded substrate.
  • the security document for example a bank note
  • Examples of physical feature encoding of a substrate as aforesaid comprise, embossing with inkless intaglio or embossing the surface by calendaring during manufacture of the substrate.
  • Two or more different encoding techniques may be combined in any substrate.
  • the invention also lies in impressing in the surface of a substrate onto which a security document is to be printed indentations and/or grooves in accordance with a first pattern which contains encoded therein a second pattern, to enable a security document printed on such a substrate to be identified by subjecting image data signals obtained from scanning the document to an appropriate mathematical algorithm to determine whether the second pattern can be found in image data signals relating to the first pattern.
  • a pattern may be encoded to produce multiple iterations of a code on the substrate.
  • the encoded pattern may not extend over the whole of the surface of the substrate forming each document but only over selected areas which align with particular printed areas of the substrate, and according to another aspect of the invention, the printed areas are selected so as to enhance the detection of the substrate surface variation during scanning and conversion of the image into image data signals.
  • Redundancy created by multiple iterations can be used to advantage since the large number of similar iterations enhances the detectability of the code by increasing the effective signal to noise ratio. This in combination with the selection of particular regions of the printed areas of the final document in which to locate the iterations, facilitates the detection by a data processor of the presence of an otherwise substantially invisible pattern in the data signals derived from the scanning.
  • the encoding of the documents must be capable of being read for example by optically scanning the documents and generating image data signals which can be handled by a computer, or by using a specialist imaging and image analysing apparatus performing this function.
  • the invention also lies in a security document substrate adapted to be identifiable as such by having detectable surface features therein feamres to enable identification as aforesaid.
  • the invention also lies in a security document when printed on a substrate as aforesaid.
  • a primary application of the invention lies in treating the surface of a substrate as aforesaid for use in the production of security documents so as to inhibit or degrade the reproduction of such security documents using a scanning process which converts the image into image data signals for controlling a printing process, in which a second control is introduced if surface encoding is detected by subjecting the image data signals to an appropriate algorithm, which second control serves to downgrade or inhibit the printing process so as to prevent the reproduction of the original document, or of a good quality reproduction thereof.
  • a second application of the invention lies in a document verification method by scanning the document and converting the optical information into electrical signals using a photosensitive device and in which for recognition purposes, a data processor is programmed to look for one or more surface encoding, information in the electrical signals which if detected in image data obtained from imaging and scanning the document, will generate a confirmation signal, validating the document, and vice versa.
  • the invention thus also provides a computer based document scanning device which can be used to validate a document by checking that one or more patterns of one or more particular feamres are present in the document.
  • bank note authentication devices can be provided at relatively low cost to be associated with tills in shops, banks and post offices, so that at transaction points bank notes tendered by the public can be verified before they are accepted.
  • the surface treatment of a substrate in accordance with the invention includes any technique which results in lighter and darker regions to be visible in the surface of a treated sheet of substrate when illuminated for scanning.
  • Either or both primary and secondary encodings may be in the form of repeat pattern which are distinguishable under appropriate illumination to provide detectable content in digital signals obtained by scanning.
  • the substrate may be embossed during its manufacture.
  • the substrate is customary in paper or sheet plastics manufacture to make the material smooth enough for printing by passing it through a high pressure nip between two steel rollers, a process known as calendaring.
  • calendaring By forming one or both of these rollers with indentations, a paper or plastics substrate forced therebetween, will be formed with an embossing pattern corresponding to the indentations.
  • the substrate will be encoded as required by the invention, and can be detected by suitable illumination and converted into digital data signals by a scanner for analysis by a data processor.
  • an encoded structure can be formed in the surface such that the actual surface of the substrate is sufficiently smooth to accept printing ink to enable a security document to be printed thereon, but at the same time contains a fine pattern of less smooth regions, which may be less receptive of printing ink.
  • the surface may also be modified by a technique in which selected regions of a substrate describe a repeat pattern by being impregnated with a fluid such as a resin, or lacquer, such that the optical absorbtion or reflectance characteristics or optical density of the substrate is altered sufficiently as between impregnated and non-impregnated areas as to be discernable under incident light as during scanning for digitising.
  • a fluid such as a resin, or lacquer
  • the surface of the substrate can be etched by a laser beam, so as to produce cavities or grooves in the surface to be printed (or awaiting printing). This technique lends itself to the production of very fine patterns in the surface of the substrate and since a laser beam can be modulated very accurately can be used to introduce depth modulation in any such grooves or cavities as well as or instead of edge or thickness of spacing modulation.
  • Watermarks alter the thickness and/or texmre of a substrate, which variations and/or can be rendered visible under incident light and can be used to form primary and/or secondary encoding of the invention. They may be formed in two ways.
  • the wet paper is embossed using an embossing roller as it is being formed, thereby impacting a mark in the paper corresponding to the embossing.
  • the embossing in a suitable repeat pattern which extends over the area of the web, so the paper can be encoded with the watermark pattern.
  • a second technique for forming a watermark uses the so-called cylinder-mould method.
  • the watermark is formed by a cylindrical wire mesh on which is impressed "mouldings" in the form of images.
  • fibres build up to a greater or lesser extent on the mesh moundings and where the thickness of the paper is greater, this gives a darker effect when viewed in transmission than do regions which are thinner and therefore which appear lighter when viewed in transmission.
  • either types of watermark is just visible in incident light this can be used to provide the background coding required by the invention.
  • either watermarking technique may be employed to apply a pattern in the surface of a substrate especially a paper substrate, which is virtually imperceptible to the naked eye, but which will appear as a low contrast pattern when subjected to incident light as where a document is arranged for scanning and digitising.
  • embossing may be applied after some or all of the printing of the document has occurred.
  • embossing may be applied after a title, or other text, or personal data for example in the case of an ID document has been printed onto a plain substrate, and a surface encoding formed as a post-printing step.
  • Encoding by embossing can be achieved whilst printing at least some regions of a document.
  • the surface encoding may be imparted to the document by so-called "blind" intaglio printing, or intaglio printing with colourless ink.
  • an image is printed using a plate containing engraved areas, some of which are filled with ink and some of which are left empty in the case of blind intaglio printing.
  • the engraved plate inked as appropriate, is pressed under high pressure against the substrate so as to cause the ink to transfer to the substrate.
  • the substrate can become embossed with the engraved image, under the pressure applied, with parts of the substrate surface being printed, and others merely embossed.
  • Figure 1 shows a banknote substrate physically formed with barcode feamres in practice not discernable to the naked eye
  • Figure 2 shows a banknote image printed over the substrate
  • Figure 3 is a flow chart of the process for embossing the barcode feamres on the substrate
  • Figures 4 and 5 show images of the banknote revealed by a computer code extraction routine
  • Figure 6 is a flow chart of one possible detection routine. Description of Embodiment
  • the resulting substrate is shown in Figure 1, except that in practice the identification feamres, in this case a repetitive barcode pattern, would be invisible to the naked eye.
  • banknote is conventionally printed over the substrate and the result is shown in Figure 4.
  • the banknote design may be printed either before or after the identification feamres physically formed in this case by embossing ( Figure 3).
  • the encoded document when scanned into a computer is converted to a digital format.
  • This typically means that the image is analysed into red, green and blue channels for each picmre element or pixel.
  • the colour of the picmre element is assigned a value in each of these channels on a scale from 0 to 255 (8 bits) typically such that a full intensity is assigned to the value 255 and 'no colour' the value 0.
  • bright white will be represented by all three channels having the value 255 and black by a zero intensity having the value 0.
  • a real image such as that of the printed banknote is scanned into the system
  • most of the pixel values will lie in a central region between, say, 230 for the paper background and 40 for the darkest print.
  • the pixels relating to the embossed encoding will be affected by the shadowing from the embossing caused by the lighting in the detection device. They will generally be within a band close to the paper background values.
  • the embossing is shallow so that the shadows are weak and mainly within a band of 20 grey scale values relative to that of the paper background.
  • the embossed encoding could be extracted using a contrast enhancement routine such as is commonly known as 'equalisation'.
  • a contrast enhancement routine such as is commonly known as 'equalisation'.
  • This type of routine sets the maximum value of the pixels in each channel to 255 and the minimum value to 0 and then attempts to smoothly redistribute the mtervening pixel values between the two. This has the effect of increasing the difference between the pixel values close to the paper background and thus those relating to the code so that they are easier to recognise in an image recognition program or routine.
  • This method has the disadvantage that other design feamres unrelated to the code are still present and need to be disregarded by the recognition routine.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Business, Economics & Management (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Printing Methods (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Glass Compositions (AREA)
  • Liquid Crystal (AREA)
  • Image Processing (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)

Abstract

L'invention concerne un substrat sur lequel doit être imprimé un document de sécurité. Ledit substrat comporte des caractéristiques d'identification qui ne sont pas visibles à l'oeil nu mais sont répétitifs de manière à pouvoir être détectés par un équipement informatique lisant un document imprimé sur ledit substrat.
PCT/GB2000/000129 1999-01-26 2000-01-20 Substrats pour impression Ceased WO2000045344A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
MXPA01007401A MXPA01007401A (es) 1999-01-26 2000-01-20 Substratos para impresion.
DE60001098T DE60001098D1 (de) 1999-01-26 2000-01-20 Substrat zum drucken
JP2000596532A JP2002536202A (ja) 1999-01-26 2000-01-20 印刷のための基板
CA002357727A CA2357727A1 (fr) 1999-01-26 2000-01-20 Substrats pour impression
HK02103076.9A HK1043417A1 (zh) 1999-01-26 2000-01-20 打印基質
EP00900703A EP1147495B1 (fr) 1999-01-26 2000-01-20 Substrats pour impression
AU30631/00A AU3063100A (en) 1999-01-26 2000-01-20 Substrates for printing
AT00900703T ATE230510T1 (de) 1999-01-26 2000-01-20 Substrat zum drucken

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9901522.4A GB9901522D0 (en) 1999-01-26 1999-01-26 Substrates for printing
GB9901522.4 1999-01-26

Publications (1)

Publication Number Publication Date
WO2000045344A1 true WO2000045344A1 (fr) 2000-08-03

Family

ID=10846407

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/000129 Ceased WO2000045344A1 (fr) 1999-01-26 2000-01-20 Substrats pour impression

Country Status (10)

Country Link
EP (1) EP1147495B1 (fr)
JP (1) JP2002536202A (fr)
AT (1) ATE230510T1 (fr)
AU (1) AU3063100A (fr)
CA (1) CA2357727A1 (fr)
DE (1) DE60001098D1 (fr)
GB (2) GB9901522D0 (fr)
HK (1) HK1043417A1 (fr)
MX (1) MXPA01007401A (fr)
WO (1) WO2000045344A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273461A2 (fr) 2001-07-06 2003-01-08 De Nederlandsche Bank N.V. Ensemble de documents de sécurité avec une filigrane sous forme d'une code à barres
WO2005105476A1 (fr) * 2004-04-27 2005-11-10 Bundesdruckerei Gmbh Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite
WO2006016112A1 (fr) * 2004-08-13 2006-02-16 Ingenia Technology Limited Procedes, produits et instruments de verification d'authenticite
US7207494B2 (en) 2001-12-24 2007-04-24 Digimarc Corporation Laser etched security features for identification documents and methods of making same
US7778437B2 (en) 1994-03-17 2010-08-17 Digimarc Corporation Media and methods employing steganographic marking
US8833663B2 (en) 2002-04-09 2014-09-16 L-1 Secure Credentialing, Inc. Image processing techniques for printing identification cards and documents
US8892556B2 (en) 2009-11-10 2014-11-18 Ingenia Holdings Limited Optimisation
US8896885B2 (en) 2004-03-12 2014-11-25 Ingenia Holdings Limited Creating authenticatable printed articles and subsequently verifying them based on scattered light caused by surface structure
US9818249B1 (en) 2002-09-04 2017-11-14 Copilot Ventures Fund Iii Llc Authentication method and system

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US5748763A (en) 1993-11-18 1998-05-05 Digimarc Corporation Image steganography system featuring perceptually adaptive and globally scalable signal embedding
US6985600B2 (en) 1994-03-17 2006-01-10 Digimarc Corporation Printing media and methods employing digital watermarking
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US7054463B2 (en) 1998-01-20 2006-05-30 Digimarc Corporation Data encoding using frail watermarks
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US6963884B1 (en) 1999-03-10 2005-11-08 Digimarc Corporation Recoverable digital content degradation: method and apparatus
AUPQ056099A0 (en) 1999-05-25 1999-06-17 Silverbrook Research Pty Ltd A method and apparatus (pprint01)
WO2001016869A1 (fr) 1999-09-01 2001-03-08 Digimarc Corporation Impression en filigrane d'images numeriques dont la brillance est determinee selon la zone
US6608919B1 (en) 1999-11-10 2003-08-19 Digimarc Corporation Method and apparatus for encoding paper with information
US20010037455A1 (en) * 2000-03-09 2001-11-01 Lawandy Nabil M. Authentication using a digital watermark
US6952485B1 (en) 2000-09-11 2005-10-04 Digimarc Corporation Watermark encoding and decoding in imaging devices and imaging device interfaces
US7246239B2 (en) 2001-01-24 2007-07-17 Digimarc Corporation Digital watermarks for checking authenticity of printed objects
US6859225B1 (en) 2000-10-20 2005-02-22 Silverbrook Research Pty Ltd Method and apparatus for fault tolerant data storage on photographs
NL1017173C2 (nl) * 2001-01-23 2002-08-14 Joh Enschedu B V Beveiligingsafbeelding voorzien van dubbelbandige codering.
US7184569B2 (en) * 2001-06-06 2007-02-27 Spectra Systems Corporation Marking articles using a covert digitally watermarked image
US8094869B2 (en) 2001-07-02 2012-01-10 Digimarc Corporation Fragile and emerging digital watermarks
ATE509326T1 (de) 2001-12-18 2011-05-15 L 1 Secure Credentialing Inc Mehrfachbildsicherheitsmerkmale zur identifikation von dokumenten und verfahren zu ihrer herstellung
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GB0001165D0 (en) 2000-03-08
GB2346110A (en) 2000-08-02
GB2346110B (en) 2001-09-05
MXPA01007401A (es) 2002-06-04
AU3063100A (en) 2000-08-18
ATE230510T1 (de) 2003-01-15
JP2002536202A (ja) 2002-10-29
CA2357727A1 (fr) 2000-08-03
GB9901522D0 (en) 1999-03-17
EP1147495B1 (fr) 2003-01-02
HK1043417A1 (zh) 2002-09-13
DE60001098D1 (de) 2003-02-06
EP1147495A1 (fr) 2001-10-24

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