GB2272861A - Apparatus for reading security documents bearing photochromic or thermochromic prints. - Google Patents

Apparatus for reading security documents bearing photochromic or thermochromic prints. Download PDF

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Publication number
GB2272861A
GB2272861A GB9224955A GB9224955A GB2272861A GB 2272861 A GB2272861 A GB 2272861A GB 9224955 A GB9224955 A GB 9224955A GB 9224955 A GB9224955 A GB 9224955A GB 2272861 A GB2272861 A GB 2272861A
Authority
GB
United Kingdom
Prior art keywords
document
colour
image
print
photochromic
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.)
Withdrawn
Application number
GB9224955A
Other versions
GB9224955D0 (en
Inventor
Bruce Godfrey Batchelor
Harry George Heller
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.)
University College Cardiff Consultants Ltd
Cardiff University
Original Assignee
University College Cardiff Consultants Ltd
Cardiff University
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 University College Cardiff Consultants Ltd, Cardiff University filed Critical University College Cardiff Consultants Ltd
Priority to GB9224955A priority Critical patent/GB2272861A/en
Publication of GB9224955D0 publication Critical patent/GB9224955D0/en
Publication of GB2272861A publication Critical patent/GB2272861A/en
Withdrawn legal-status Critical Current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
    • B42D25/30—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
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
    • 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
    • G07D7/06—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 wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Abstract

A security-marked document 10 carries an image in reversibly colour-changeable photochromic or thermochromic print and also carries an image in constant-colour print. An apparatus for reading the security markings comprises means (e.g. UV light 34) for acting upon the document to change the colour of the photochromic print, and means (e.g. camera 30) for viewing the document after the colour-change and to form electrical signals representing the image being viewed, so that the document can be verified. These image-representing signals may be compared with corresponding signals obtained by viewing the document before the colour-change is effected. The colour-changeable print and the constant capture colour print may be in encoded form. A keyboard 40 may be used to input a PIN code into the image processing unit 32. <IMAGE>

Description

Documents with security markings This invention relates to documents which carry security markings, to apparatus for forming such security markings on documents and to apparatus for reading such security markings from documents.
In this specification, the term "document" includes single-sheet articles such as tickets, banknotes, cheques, certificates and receipts and also includes cards e.g. credit cards and identification cards even though made of plastics or other materials rather than paper.
It is common for documents to carry markings in addition to normal human-readable printing, for the purposes of security. The markings may consist of a visible, machinereadable code such as a bar code. Such encoded markings must be read by machine in order that the document, or its holder, can be verified. For example the encoding may identify or be personal to the holder of the document. The nature of the markings needs to be secure in order to prevent fraudulent copying.
We have now devised arrangements for forming security markings on documents and for reading such markings.
In accordance with this invention, there is provided an apparatus for security-marking a document, comprising means for applying an image in reversibly colour-changeable photochromic or thermochromic print to the document and means for applying an image in constant-colour print to the document.
The reversibly colour-changeable print which is applied to the document may be an encoded image. The constant-colour print which is applied to the document may also be an encoded image. The printing means may comprise or include ink jet or other printers.
The apparatus may further comprise a viewing means (e.g. a video camera or document scanner) for directing at an object and forming electrical signals representing an image of the object: these electrical signals may then be encoded before controlling the printing means.
Also in accordance with this invention, there is provided a document which carries an image in reversibly colour-changeable photochromic or thermochromic print and also carries an image in constant-colour print.
For the reversibly colour-changeable print, photochromic inks or dyes may be used. Such inks or dyes can be switched from their normal or initial colour condition (typically colourless) to another colour by illuminating them, (typically with ultraviolet light: some photochromic inks or dyes can be switched back to their initial colour (photochemically bleached) by illumination with light of a different wavelength (typically in the visible spectrum): other photochromic inks or dyes fade back thermally to their initial colour at ambient temperatures.
Instead, for the reversibly colour-changeable print, thermochromic inks or dyes may be used. Such inks or dyes change from their initial colour to another colour when heated, and revert to their initial colour upon cooling.
Further in accordance with this invention, there is provided an apparatus for reading security markings from a document, comprising means for acting upon the document to change the colour of photochromic or thermochromic print carried by the document, means for viewing the document after said colour-change and to form electrical signals representing the image which is viewed, and means for processing the imagerepresenting signals to verify the document.
Preferably this apparatus is arranged also to view the document either before the colour-change or after the print has returned to its initial colour condition, and to compare the data corresponding to the image when viewed under normal colour conditions and colour-changed conditions. In this way the apparatus forms a resultant corresponding to the photochromic or thermochromic image only (i.e. free of any constant-colour print on the document).
Embodiments of this invention will now be described by way of examples only and with reference to the accompanying drawings, in which: FIGURE 1 is a schematic diagram of an apparatus for applying images including security markings to a document; and FIGURE 2 is a schematic diagram of an apparatus for reading security markings from a document.
Referring to Figure 1, there is shown in schematic form an apparatus for printing or otherwise applying images to a document 10. The apparatus comprises a video camera, or document scanner 12 for viewing an object, and an image capture and pre-processing unit 14 for receiving the corresponding output signal from the camera or document scanner 12: the unit 14 digitises the signal from the camera, and pre-processes and stores this data. The apparatus further comprises two ink jet printers 20 and 22, one using a photochromic ink and the other using visible ink. The apparatus is arranged to encode an image held by unit 14, using encypher units 24 or 26, and control the ink jet printer 20 or 22 to print the encoded image onto the document 10.The same image may be separately encoded at 24 and 26 and these separately encoded images then printed onto the document by the respective ink jet printers.
Alternatively, different images may be separately encoded at 24 and 26 and then printed. The printed document carries an image in the visible ink, which is of constant colour, and also carries an image in the photochromic ink, which is normally colourless and therefore not visible. As described so far, both of these images are encoded, but it may be instead that only the photochromic ink image is encoded.
Figure 2 shows an apparatus for reading the document 10. This apparatus comprises a video camera or document scanner 30 for viewing the document, and an image capture and pre-processing unit 32 for receiving the corresponding output signal from the camera or document scanner 30. The apparatus further comprises an ultraviolet (W) light source 34 and a white light source 36. In use the document 10 is illuminated by the ultraviolet light so that its photochromic print will change to a visible colour: an image of the document under this condition is captured by the camera or document scanner 30 and stored in digital form. The document 10 is then illuminated by the white light source 36 until the photochromic print on the document changes back to its initial, invisible condition.
An image of the document under this condition is captured by the camera or document scanner 30, either at this stage or before its illumination by the ultraviolet light. The two images which are thus captured and stored can be compared or "subtracted" one from the other to provide a resultant corresponding to the photochromic ink images alone. This is then decyphered by an image processing unit indicated at 38.
For decyphering, the image processing may compare the photochromic print image, which has been read from the document 10, with stored references to determine whether the document is valid. Alternatively, the image processing may run a series of algorithms on the image data in order to verify the documents. The image processing can similarly be carried out on the visible print image, i.e. the image captured whilst the photochromic print is in its colourless condition.
In verifying the document, the image processing may also take account of a code, such as a personal identification number (PIN), entered separately on a keyboard 40, as indicated in Figure 2.
The use has been described of photochromic inks or dyes which can be switched from a normal or initial colourless condition to a coloured condition by illumination by ultraviolet light and can be switched back (photochemically bleached) by illumination by white light. Instead photochromic inks or dyes may be used which revert or fade back thermally to their initial colour condition, at ambient temperatures.
Another option is to use thermochromic inks or dyes, which change from an initial colour condition to another when heated and which revert to their initial colour condition upon cooling: in this case the reading apparatus includes a heater for heating the document to induce the colour change.

Claims (11)

1) An apparatus for security-marking a document, comprising means for applying an image in reversibly colourchangeable photochromic or thermochromic print to the document, and means for applying an image in constant-colour print to the document.
2) An apparatus as claimed in claim 1, arranged to apply the colour-changeable print to the document as an encoded image.
3) An apparatus as claimed in claim 1 or 2, arranged to apply the constant-colour print to the document as an encoded image.
4) An apparatus as claimed in claim 2 or 3, further comprising viewing means for directing at an object and forming electrical signals representing an image of the object, and means for encoding said signals before applying them as control signals to a said image applying means.
5) An apparatus substantially as herein described with reference to Figure 1 of the accompanying drawings, for security-marking a document.
6) An apparatus for reading security markings from a document, comprising means for acting upon the document to change the colour of photochromic or thermochromic print carried by the document, means for viewing the document after said colour-change and to form electrical signals representing the image being viewed, and means for processing the imagerepresenting signals to verify the document.
7) An apparatus as claimed in claim 6, arranged to view said document either before said colour-change or after the print has returned to its initial colour condition, and to compare said electrical signals representing said image when viewed under normal colour conditions and colour-changed conditions.
8) An apparatus substantially as herein described with reference to Figure 2 of the accompanying drawings, for reading security markings from a document.
9) A document which carries an image in reversibly colourchangeable photochromic or thermochromic print and which also carries an image in constant-colour print.
10) A document as claimed in claim 9, in which the photochromic print is responsive to illumination with light of a selected wavelength to effect a reversible colour change.
11) A document as claimed in claim 9 and substantially as herein described.
GB9224955A 1992-11-28 1992-11-28 Apparatus for reading security documents bearing photochromic or thermochromic prints. Withdrawn GB2272861A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9224955A GB2272861A (en) 1992-11-28 1992-11-28 Apparatus for reading security documents bearing photochromic or thermochromic prints.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9224955A GB2272861A (en) 1992-11-28 1992-11-28 Apparatus for reading security documents bearing photochromic or thermochromic prints.

Publications (2)

Publication Number Publication Date
GB9224955D0 GB9224955D0 (en) 1993-01-20
GB2272861A true GB2272861A (en) 1994-06-01

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GB9224955A Withdrawn GB2272861A (en) 1992-11-28 1992-11-28 Apparatus for reading security documents bearing photochromic or thermochromic prints.

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844097A1 (en) * 1996-11-21 1998-05-27 Ncr International Inc. Thermal paper with security features and security ink therefor
US5883043A (en) * 1997-08-27 1999-03-16 Ncr Corporation Thermal paper with security features
WO2000007151A1 (en) * 1998-07-27 2000-02-10 Siemens Aktiengesellschaft Security paper, method and device for checking the authenticity of documents recorded thereon
EP0997837A2 (en) * 1998-10-28 2000-05-03 Hewlett-Packard Company Integrated printing/scanning system using invisible ink for document tracking
EP1013463A2 (en) * 1998-12-21 2000-06-28 Alps Electric Co., Ltd. Information recording medium and information recording method using ultraviolet fluorescent inks
GB2345879A (en) * 1998-12-02 2000-07-26 B & H Liquid Crystal Devices A security article eg a document or game ticket, including a liquid crystal or thermochromic ink
WO2000054985A1 (en) * 1999-03-12 2000-09-21 De La Rue International Limited In security elements
EP1038690A1 (en) * 1999-03-22 2000-09-27 Fabriques De Tabac Reunies S.A. Printed latent raster image
WO2003002351A1 (en) * 1999-12-21 2003-01-09 Mib - Munich Innovative Biomaterials Gmbh Non-falsifiable information carrier material, information carrier produced therefrom and test device therefor
EP1299851A1 (en) * 2000-05-19 2003-04-09 Technology Innovations, LLC Document with embedded information
WO2004008378A1 (en) * 2002-07-12 2004-01-22 Datasound Gmbh Method an device for reading encoded information
US6770687B1 (en) 1996-11-21 2004-08-03 Ncr Corporation Water-based dual security ink
EP1445742A1 (en) * 2003-01-31 2004-08-11 Quiss Gmbh Identification device
WO2005016654A1 (en) * 2003-08-15 2005-02-24 Ciba Specialty Chemicals Holding Inc. Method of printing a time-temperature integrator onto a substrate
EP1862326A2 (en) * 2006-05-31 2007-12-05 Agustín José Luis Pérez Writing and reading data system, starting from a chromatic printed information that modifies patterns emitted by an electromagnetic waves source, introducing biases that conform new patterns, giving place to new data categories matched to a code
EP1901247A1 (en) * 2006-09-15 2008-03-19 NCR Corporation Self-service deposit method and apparatus
FR2922905A1 (en) * 2007-10-26 2009-05-01 Arjowiggins Licensing Soc Par SAFETY STRUCTURE COMPRISING A THERMOCHROMIC ELEMENT AND A PHOTOCHROMIC ELEMENT
US7645719B2 (en) 2004-10-13 2010-01-12 Ncr Corporation Thermal paper with security features
EP2322580A1 (en) * 2005-07-01 2011-05-18 3DTL, Inc. Systems and methods for creating optical effects on media to prevent counterfeit
WO2012175542A1 (en) * 2011-06-21 2012-12-27 Bundesdruckerei Gmbh Method and device for creating a document reference data set on the basis of a document
US8550358B2 (en) 2006-05-31 2013-10-08 Agustin Jose Luis Perez Procedure for data encoding and reading starting from interference of wave patterns generated in a printed chromatic system
WO2014090839A1 (en) * 2012-12-14 2014-06-19 Oberthur Fiduciaire Sas Method for checking the authenticity of a security document

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277774A (en) * 1978-08-28 1981-07-07 Laurel Bank Machine Co., Ltd. Bill discriminating apparatus
GB2201376A (en) * 1987-01-13 1988-09-01 Liquid Crystal Devices Ltd Security documents
WO1989000319A1 (en) * 1987-06-30 1989-01-12 Global Security Ab A method, an arrangement and a chemical agent for marking of banknotes, valuable documents etc. and detection equipment of such a marking
EP0327788A2 (en) * 1988-01-12 1989-08-16 Sicpa Holding S.A. Reversibly photochromic printing inks
GB2229189A (en) * 1989-02-14 1990-09-19 Rue Company P L C De Ink composition for security documents

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277774A (en) * 1978-08-28 1981-07-07 Laurel Bank Machine Co., Ltd. Bill discriminating apparatus
GB2201376A (en) * 1987-01-13 1988-09-01 Liquid Crystal Devices Ltd Security documents
WO1989000319A1 (en) * 1987-06-30 1989-01-12 Global Security Ab A method, an arrangement and a chemical agent for marking of banknotes, valuable documents etc. and detection equipment of such a marking
EP0327788A2 (en) * 1988-01-12 1989-08-16 Sicpa Holding S.A. Reversibly photochromic printing inks
GB2229189A (en) * 1989-02-14 1990-09-19 Rue Company P L C De Ink composition for security documents

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844097A1 (en) * 1996-11-21 1998-05-27 Ncr International Inc. Thermal paper with security features and security ink therefor
US6770687B1 (en) 1996-11-21 2004-08-03 Ncr Corporation Water-based dual security ink
US5883043A (en) * 1997-08-27 1999-03-16 Ncr Corporation Thermal paper with security features
AU758692B2 (en) * 1998-07-27 2003-03-27 Joergen Brosow Security paper, method and device for checking the authenticity of documents recorded thereon
WO2000007151A1 (en) * 1998-07-27 2000-02-10 Siemens Aktiengesellschaft Security paper, method and device for checking the authenticity of documents recorded thereon
US6918535B1 (en) 1998-07-27 2005-07-19 Infineon Technologies Ag Security paper, method and device for checking the authenticity of documents recorded thereon
US6644764B2 (en) 1998-10-28 2003-11-11 Hewlett-Packard Development Company, L.P. Integrated printing/scanning system using invisible ink for document tracking
EP0997837A2 (en) * 1998-10-28 2000-05-03 Hewlett-Packard Company Integrated printing/scanning system using invisible ink for document tracking
EP0997837A3 (en) * 1998-10-28 2002-08-14 Hewlett-Packard Company, A Delaware Corporation Integrated printing/scanning system using invisible ink for document tracking
GB2345879A (en) * 1998-12-02 2000-07-26 B & H Liquid Crystal Devices A security article eg a document or game ticket, including a liquid crystal or thermochromic ink
GB2345879B (en) * 1998-12-02 2003-03-05 B & H Liquid Crystal Devices Security articles
EP1013463A3 (en) * 1998-12-21 2000-11-22 Alps Electric Co., Ltd. Information recording medium and information recording method using ultraviolet fluorescent inks
EP1013463A2 (en) * 1998-12-21 2000-06-28 Alps Electric Co., Ltd. Information recording medium and information recording method using ultraviolet fluorescent inks
WO2000054985A1 (en) * 1999-03-12 2000-09-21 De La Rue International Limited In security elements
EP1038690A1 (en) * 1999-03-22 2000-09-27 Fabriques De Tabac Reunies S.A. Printed latent raster image
WO2000056553A1 (en) * 1999-03-22 2000-09-28 Philip Morris Products S.A. Latent halftone image
WO2003002351A1 (en) * 1999-12-21 2003-01-09 Mib - Munich Innovative Biomaterials Gmbh Non-falsifiable information carrier material, information carrier produced therefrom and test device therefor
EP1299851A1 (en) * 2000-05-19 2003-04-09 Technology Innovations, LLC Document with embedded information
EP1299851A4 (en) * 2000-05-19 2004-08-18 Technology Innovations Llc Document with embedded information
WO2004008378A1 (en) * 2002-07-12 2004-01-22 Datasound Gmbh Method an device for reading encoded information
EP1445742A1 (en) * 2003-01-31 2004-08-11 Quiss Gmbh Identification device
WO2005016654A1 (en) * 2003-08-15 2005-02-24 Ciba Specialty Chemicals Holding Inc. Method of printing a time-temperature integrator onto a substrate
US7645719B2 (en) 2004-10-13 2010-01-12 Ncr Corporation Thermal paper with security features
EP2327744A3 (en) * 2005-07-01 2011-10-05 3DTL, Inc. Systems and methods for creating variable optical effects on media
EP2322580A1 (en) * 2005-07-01 2011-05-18 3DTL, Inc. Systems and methods for creating optical effects on media to prevent counterfeit
EP1862326A3 (en) * 2006-05-31 2009-04-08 Agustín José Luis Pérez Writing and reading data system, starting from a chromatic printed information that modifies patterns emitted by an electromagnetic waves source, introducing biases that conform new patterns, giving place to new data categories matched to a code
EP1862326A2 (en) * 2006-05-31 2007-12-05 Agustín José Luis Pérez Writing and reading data system, starting from a chromatic printed information that modifies patterns emitted by an electromagnetic waves source, introducing biases that conform new patterns, giving place to new data categories matched to a code
US8500020B2 (en) 2006-05-31 2013-08-06 Agustín Jóse Luis Pérez Writing and reading data system, starting from a chromatic printed information that modifies patterns emited by an electromagnetic waves source, introducing biases that conform new patterns, giving place to new data categories matched to a code
US8550358B2 (en) 2006-05-31 2013-10-08 Agustin Jose Luis Perez Procedure for data encoding and reading starting from interference of wave patterns generated in a printed chromatic system
US7401730B2 (en) 2006-09-15 2008-07-22 Ncr Corporation Self-service deposit method and apparatus
EP1901247A1 (en) * 2006-09-15 2008-03-19 NCR Corporation Self-service deposit method and apparatus
FR2922905A1 (en) * 2007-10-26 2009-05-01 Arjowiggins Licensing Soc Par SAFETY STRUCTURE COMPRISING A THERMOCHROMIC ELEMENT AND A PHOTOCHROMIC ELEMENT
WO2009056728A1 (en) * 2007-10-26 2009-05-07 Arjowiggins Licensing Security structure comprising a thermochromic element and a photochromic element
WO2012175542A1 (en) * 2011-06-21 2012-12-27 Bundesdruckerei Gmbh Method and device for creating a document reference data set on the basis of a document
WO2014090839A1 (en) * 2012-12-14 2014-06-19 Oberthur Fiduciaire Sas Method for checking the authenticity of a security document
FR2999764A1 (en) * 2012-12-14 2014-06-20 Oberthur Fiduciaire Sas METHOD FOR VERIFYING THE AUTHENTICITY OF A SECURITY DOCUMENT
CN105051796A (en) * 2012-12-14 2015-11-11 欧贝特信托公司 Method for checking the authenticity of security document
CN105051796B (en) * 2012-12-14 2017-09-01 欧贝特信托公司 The method for checking the authenticity of secure file

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