WO2001087632A1 - Impression de zone de securite - Google Patents

Impression de zone de securite Download PDF

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Publication number
WO2001087632A1
WO2001087632A1 PCT/GB2001/002109 GB0102109W WO0187632A1 WO 2001087632 A1 WO2001087632 A1 WO 2001087632A1 GB 0102109 W GB0102109 W GB 0102109W WO 0187632 A1 WO0187632 A1 WO 0187632A1
Authority
WO
WIPO (PCT)
Prior art keywords
zone
dots
printing
security
array
Prior art date
Application number
PCT/GB2001/002109
Other languages
English (en)
Inventor
Ian Smith
Original Assignee
Ascent Systems Software Limited
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 Ascent Systems Software Limited filed Critical Ascent Systems Software Limited
Priority to AU2001256492A priority Critical patent/AU2001256492A1/en
Publication of WO2001087632A1 publication Critical patent/WO2001087632A1/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/121—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by printing code marks
    • 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
    • B41M3/146—Security printing using a non human-readable pattern which becomes visible on reproduction, e.g. a void mark

Definitions

  • the invention relates to printing, and specifically to a security area incorporated into a print, and to a printing template and a method for printing the same.
  • the invention in particular relates to security portions which are adapted to be incorporated into regular printed areas, and in particular to security portions which are substantially undetectable by eye when so incorporated, but which deter, hinder or obstruct unauthorised copying of the printed item.
  • counterfeiting or unauthorised reproduction of printed matter is a perennial problem which has been exacerbated in recent years by the advent of widely available colour copying facilities. It is estimated that counterfeits account for 5% of world trade value, and therefore any printing device or method which can deter or hinder unauthorised copying is desirable.
  • Counterfeiting is not only a problem in security products, that is printed products having relatively high inherent values such as stamps, bank notes, gift vouchers event ticketing and the like, but is also a potential problem in relation to packaging, in particular in relation to the packaging of counterfeit contents for example in the pharmaceutical industry or in relation to CDs, wine and spirit labels, and branded garments.
  • the invention relates to printing technology in which the printed area is made up of one or more arrays of printed dots constituting the picture.
  • Simple security adaptations have been proposed which rely for their effectiveness on the fact that although modern colour copiers have become extremely effective at the accurate reproduction of tone, their resolution is insufficient to enable accurate reproduction of individual dots making up the print if those dots are sufficiently small. Accordingly, security areas can be printed into the original print based on modifications at this scale which are not susceptible of copying, and therefore enable unauthorised copies to be distinguished from properly printed originals.
  • An example of such a system is an adaptation of a conventional four-colour printing, in which magenta, cyan, yellow and black are all printed as dot screens to make up a colour picture.
  • the technique is adapted so that one of the colours is instead printed as a line screen.
  • a suitable decoder which will selectively transmit so as to distinguish the line screen, security printing in ages can be incorporated.
  • the technique is not without limitation.
  • the security printing can only be incorporated in a four-colour printed full colour picture. Since printed matter does not always include full-colour four-colour printed regions, this limits its applicability.
  • the colour which is printed as a line screen is particularly susceptible to recognition by the user of the decoder. In practice, this tends to lead to a strong preference for use of magenta, or possibly black, as the line screen printed colour, and the technique is therefore of limited effectiveness when applied to pictures where these colours do not predominate.
  • An alternative approach particularly suited to single-colour printing, involves variation in size of the printed dot.
  • a single- colour printed area is applied in which the overall ink density (that is ratio of printed dot area to unprinted substrate area) is constant, so that the colour perceived by eye is constant.
  • the printed area is made up of zones comprising relatively large (and consequently relatively widely spaced) printed dots, and other zones comprising relatively small (and consequently relatively closely spaced) printed dots.
  • the technique is further limited in practice in that it necessitates precise correlation between printed dot and unprinted area in both the large and small dot areas to ensure consistent colour throughout, which is likely to be fairly specific to given ink and paper combinations. This is because these factors will affect the degree to which the printed dot is spread. Use of a lower quality paper or less viscous ink will tend to lead to greater dot spread. Since the relative effect of this spread will inevitably differ between large and small dots, the effect on the colour of the large and small dot areas will differ, and the security pattern will become visible. For obvious reasons, a pattern which is visible in the printed original is inherently less effective.
  • a printing template comprises a stored data set of dot positions for printing an array of dots onto a substrate, which incorporates a security zone in which zone dots in the array are laterally displaced relative to a background zone, and further incorporates a transition zone at the boundary between the security zone and the background zone, in which zone the extent of displacement of the print dots undergoes a progressive increase from a minimally displaced position at an edge of the transition zone adjacent to the background zone to an essentially fully displaced position at an edge of the transition zone adjacent to the security zone.
  • a print By displacement of the array of dots within the security zone, a print can be produced using the template which incorporates a security pattern.
  • the security print pattern in the form of areas of displaced printed dots, may incorporate lettering, logos, geometric designs or other suitable devices.
  • the invention is applicable to any essentially digital process in which the printed image is formed of at least one array of discrete dots.
  • Reference to a stored data set of dot positions is to be interpreted as reference to a data set of dot positions stored in any form and in association with any medium whatsoever which ultimately allows the positions to be read and applied by a suitable printing process to produce an array of printed dots on a substrate in accordance with the positions stored in the data set.
  • the printing template is to be similarly construed as comprising any template which can ultimately be used by suitable printing means to generate an image with printed dots arrayed in accordance with instructions in the data set.
  • the printing template may be a physical printing surface, such as a printing screen.
  • the stored data set of dot positions is essentially comprised of the arrayed printing areas physically disposed upon the printing surface.
  • the printing template may be an instructional template in which the data set is stored on a suitable data carrier, for example electronically, in a readable form, such that the instructional template is adapted either for preparation of a physical printing surface as above described, or for direct control of a printing device, in either instance usable in association with suitable printing means to produce a printed array of dots having the characteristics of the invention.
  • a suitable data carrier for example electronically
  • the instructional template is adapted either for preparation of a physical printing surface as above described, or for direct control of a printing device, in either instance usable in association with suitable printing means to produce a printed array of dots having the characteristics of the invention.
  • transition zone The presence of a transition zone is critical. If the array of dots were merely displaced in the security zone relative to an undisplaced background, the edges of the displaced area would be visible to the naked eye. An incorporation of the transition zone prevents this. The variation in the degree of displacement between any given dot in the transition zone and other dots adjacent thereto is sufficiently small that no distortion in the pattern is perceptible by the user's eye, and the security print pattern is therefore not visible in the original printing.
  • the invention does not require four-colour printing of a colour printed area to be effective, and indeed is preferably suited to a single-colour printing process.
  • the invention does not require that different areas are produced with the same colour intensity by use of precisely controlled variations in spot size and spacing. Rather, the invention uses more conventional printing techniques, in which if a single colour area is desired, this may simply be produced by printing an array of uniformally spaced (save for the displacement) uniformally sized dots.
  • the printing template comprises a stored data set of a substantially uniform array of substantially commonly sized, substantially evenly spaced printing dots (save for the displacement in the security area) to produce a printed area of generally even colour by a single-colour process.
  • a printing template may be prepared in which printing dot sizes are variable in conventional manner so as to produce areas of varied colour intensity in the entirely conventional manner.
  • a printed area may be produced which incorporates both visible patterns (in the form of printed zones of varying colour intensity in the conventional manner) and security patterns not visible to the naked eye (in the form of security zones displaced in accordance with the invention).
  • Printing dots in the security zone may be offset relative to printing dots in the main background zone by displacement in any direction, whether in a direction parallel to a direction of the screen in the main zone, or in any other direction.
  • the degree of displacement may be any suitable fraction of the period of dots in the main background zone. It will be apparent that the most marked effect would be produced if dots in the security zone are displaced by substantially half of the width between the dots, and for may applications this will represent the preferred embodiment. Nevertheless, other displacements may be considered provided they are sufficient to enable the security zone to be distinguished from the main background print zone. Typically, displacements of 0.2 to 0.5 times the period between the dots will be preferred.
  • Transition to this displacement is effected gradually in the transition zone.
  • a dot in the transition zone is displaced from its neighbours less than 0.1 times the period between the dots, more preferably 0.05 to 0.01 times.
  • the resolution of the array of dots in the screen or other dataset, and the consequent resolution of any resulting print is such that the resolution of conventional copying devices is insufficient accurately to reproduce individual printed dots. Accordingly, whilst an unauthorised copy might accurately reproduce the printing tones of the original, it will not succeed in reproducing the patterns made by the security zone or zones. The copy will thus be distinguishable from the original.
  • the resolution of the screen is preferably at least 120 lines per inch, more preferably 200 lines per inch. For some applications, even higher resolutions might be appropriate. For example, it has been suggested that printing security devices could be used in conjunction with, and incorporated upon with, holograms, in which case a resolution of 700 to 800 lines per inch or greater is likely to be preferred.
  • the required resolution for the screen of the present invention need only be such as to be greater than that of most copying devices for the invention to be effective.
  • higher resolution of the printing screen may be required, this is by virtue of the present invention that it is adaptable to such improvements in technology without departing from its general principles.
  • a printed article produced in conventional manner using the printing template of the first aspect of the invention that is a printed article comprising an array of dots printed on a substrate, the printed array incorporating a security zone in which dots in the array are laterally displaced relative to a background zone, and further incorporating a transition zone at the boundary between the security zone and the background zone, in which zone the extent of displacement of the print dots undergoes a progressive increase from a minimally displaced position at an edge of the transition zone adjacent to the background zone to an essentially fully displaced position at an edge of the transition zone adjacent to the security zone.
  • the displaced zone allows a security print pattern to be incorporated, whilst the transition zone prevents this security pattern from being perceptible by a user's eye as hereinbefore described.
  • the printed article so produced will thus incorporate a security zone which is not detectable by the naked eye, moreover, any attempt to reproduce the printed article in a colour copier will generally produce an apparently good copy.
  • the pattern in the security zone will generally not be visible to the naked eye in the copy, which will merely reproduce the tone of single colour or printed visible pattern as the case may be.
  • the resolution of the copier is not sufficient, the detailed security feature will not have been reproduced in the unauthorised copy, so that the original and unauthorised copy will be detectably different.
  • the pattern incorporated into the security zone of the original printing in accordance with the present invention can be readily detected, and accordingly the original an unauthorised copy readily distinguished. Whilst a microscopic examination will identify any discrepancies, it is clearly preferable if rapid identification can be carried out on a microscopic scale. It is a particular advantage of the invention that this is readily facilitated, in that it will be a simple matter to develop suitable detection means, for example in the form of selectively transmissive screens, to identify the presence of the security printing pattern in a genuine print (and equally, its absence in an authorised copy).
  • the invention further comprises detection means having suitably selective transmissive properties to distinguish the security print pattern when used in association with a printed article produced in accordance with the invention.
  • a particularly preferred form of detector comprises a detection screen or film comprising a network of alternating substantially transparent and substantially opaque regions having the same periodicity as the array of dots. When this detector is placed over the original print, it will selectively distinguish between displaced and undisplaced regions, and the pattern of printing in the security zone will become visible. Using such an embodiment of detector, particularly marked contrast is produced, since the eye is distinguishing between opaque regions of the detector and light transmitted through the transparent regions.
  • kit of parts for security printing comprising at least one printing template as hereinbefore described and/or at least one printed article as hereinbefore described together with a detector as above described.
  • the network pattern of the detector matches not only the period but also the angle of the pattern of dots on the template or printed area. This provides a degree of additional security, since when the detector is used in conjunction with a print to be detected, any need to rotate the detector relative to the print will be suggestive that the print is not a genuine original.
  • a method of manufacture of a printing template for use in a printing process in which a printed image is formed of at least one array of discrete dots comprising preparing a stored data set of dot positions for printing the array of dots onto a substrate which incorporates a security zone in which dots in the array are laterally displaced relative to a background zone and further incorporates a transition zone at the boundary between the security zone and the background zone, in which zone the extent of displacement of the print dots undergoes a progressive increase from a minimally displaced position at an edge of the transition zone adjacent to the background zone to an essentially fully displaced position at an edge of the transition zone adjacent to the security zone.
  • the method may produce a template in the form of a physical printing surface such as a printing screen.
  • the method may produce an instructional template for example in the form of a readable numerical file, and in a preferred embodiment of this method, the method comprises the further step of using the numerical file to prepare a physical printing surface or additionally or alternatively using the numerical file to prepare a printed article, in each case with the dots arrayed in accordance with the instructions comprised in the stored data set.
  • the data set is created on a suitable manipulatable and readable storage medium, and the method first comprises preparation of a basic data set and further comprises the input of data regarding a predetermined desired security print pattern for a security zone, using the inputted data to manipulate the data set to shift the position of dots in security zone, and to create a transition zone as hereinbefore described.
  • the method thus produces a readable output data set.
  • a computer programme for receiving the above input, manipulating the data in the manner described, and for producing a template in accordance with the invention in readable form, and/or optionally further controlling printing means to produce a printed image embodying the principles of the invention as hereinbefore described; the said computer programme carried on a suitable computer-readable storage medium; and the said template in computer- readable form stored on a suitable storage medium.
  • a method of security printing comprising the steps of printing an array of dots onto a substrate, which array incorporates a security zone in which dots in the array are laterally displaced relative to a background zone and further incorporates a transition zone at the boundary between the security zone and the background zone in which certainly the extent of the displacement of the print dots undergoes a progressive increase from a minimally displaced position at an edge of the transition zone adjacent to the background zone to an essentially fully displaced position at an edge of the transition zone adjacent to the security zone.
  • the method further comprises preparing a detection film comprising a network of zones of substantial opacity and zones of substantial transparency, having the same period, and optionally the same angle, as the print dot array.
  • the invention further comprises the use of a security zone in which dot positions are shifted relative to a background zone together with a transition zone as hereinbefore described to produce a security printing pattern, and in particular a security printing pattern invisible to the naked eye, in a printing template and/or printed article.
  • the invention further comprises the use of a printed article as hereinbefore described in conjunction with a detector as hereinbefore described to enable identification of genuine printed articles and to distinguish between genuine printed articles and unauthorised copies thereof.
  • the invention is not limited to any particular printing process, but is suitable as an adaptation to all manner of printing processes comprising arrays of dots, which will be familiar to those skilled in the art.
  • Figure 1 is a schematic illustration of an area printed in accordance with the invention
  • Figure 2 is a flow diagram illustrating the principles underlying the generation of a data set of dot positions in accordance with the invention.
  • Figure 1 illustrates a security printed area printed onto a paper substrate which comprises both letters and patterns.
  • the figure is purely schematic, and in particular it will be understood that it should not be considered as suggestive of scale: in practice a much finer dot resolution, and consequently a much more gradual change in dot position in the transition zone, will be expected.
  • a printed area (1) is printed on a paper substrate (2).
  • the printed area (1) is printed using a conventional screen printing process with single colour ink to an ink density of around 20% with a screen resolution of around 200 dots per inch.
  • the printed area (1) incorporates a background zone (3) in which dot positions are unmodified, an area of security printed pattern (4) in which dots have been shifted by exactly half a period, and a transition zone (5) which ensures that the impact of the shift in the security zone is gradual and not perceptible by eye.
  • the transition zone is shown in greater detail in the inset part of Figure 1 (not to scale).
  • printed dots (6) are shown arrayed in the base zone (3), transition zone (5), and security printed zone (4).
  • a network of grid line (7) has been superimposed on the inset which is illustrative of the unmodified dot positions, and which therefore assists in showing modification of dot positions in the transition zone (5) and security zone (4).
  • the inset area shows an edge where shifting of the pattern in one dimension only is necessary. However, it will be understood that at corners, curves and the like the same principles will be applied in two dimensions. Provided distortions in position are small between a given dot and all of its neighbours, the overall transition will not be perceptible on a macroscopic scale.
  • An example of a method of generating a suitable data set of dot positions is illustrated by the flow diagram in Figure 2.
  • An unmodified data set comprising an array of conventional dot positions (either a uniform array for single block colour, or an array incorporating conventional printing patterns) is loaded into a central processor (12).
  • Information (13) regarding preselected shapes, patterns or text for a security printing is also fed into the central processor (12).
  • the central processor (12) applies the information (13) to the basic data set in (11) to produce an output data set (14) incorporating instructions for the security printing.
  • the central processor (12) is the CPU of a suitable computer, onto which the data set (11) is loaded, the information (13) is input by a suitable input means, a transformation programme has been preloaded which is capable of transforming the data set (11) responsive to the instructions (13) and producing an output data set (14).
  • the output data set is stored in machine readable form on the disk (15) or other suitable storage medium, for onward transmission to a user.
  • the user applies the data set to produce a printing template, or to produce a printed image directly.
  • the output data set (14) is transmitted directly to a printer device (16) adapted to read the data set and produce a print (17) directly.
  • the invention lies in manipulation of dot positions and in the use of a transition zone to prevent visibility of the manipulation on a macroscopic scale, and that as such the invention is generally applicable to the full range of printing methods and apparatus where arrays of dots are used to make the printed area.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un gabarit d'impression qui comprend un ensemble de données stockées concernant des positions de points, servant à imprimer un réseau de points (6) sur un substrat (2). Ledit gabarit comprend une zone de sécurité (4) dans laquelle des points de zone du réseau sont déplacés latéralement relativement à une zone de fond (3). Ultérieurement, une zone de transition (5) est incorporée à la limite entre la zone de sécurité et la zone de fond, zone dans laquelle l'étendue du déplacement des points d'impression subit une augmentation progressive d'une position déplacée au minimum au niveau d'un bord de la zone de transition adjacente à la zone de fond, à une position sensiblement déplacée dans son entier au niveau d'un bord de la zone de transition adjacente à la zone de sécurité. L'invention concerne également un article imprimé, un gabarit d'impression ainsi que leur procédé de préparation.
PCT/GB2001/002109 2000-05-17 2001-05-15 Impression de zone de securite WO2001087632A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001256492A AU2001256492A1 (en) 2000-05-17 2001-05-15 Security printing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0011751.5 2000-05-17
GB0011751A GB0011751D0 (en) 2000-05-17 2000-05-17 Security apparatus

Publications (1)

Publication Number Publication Date
WO2001087632A1 true WO2001087632A1 (fr) 2001-11-22

Family

ID=9891672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002109 WO2001087632A1 (fr) 2000-05-17 2001-05-15 Impression de zone de securite

Country Status (3)

Country Link
AU (1) AU2001256492A1 (fr)
GB (1) GB0011751D0 (fr)
WO (1) WO2001087632A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003067892A1 (fr) 2002-02-08 2003-08-14 Ascent Systems Software Limited Procede d'incorporation d'une image secondaire dans une image primaire
US6980654B2 (en) 2003-09-05 2005-12-27 Graphic Security Systems Corporation System and method for authenticating an article
US6985607B2 (en) 2003-03-27 2006-01-10 Graphic Security Systems Corporation System and method for authenticating objects
US7421581B2 (en) 2003-09-30 2008-09-02 Graphic Security Systems Corporation Method and system for controlling encoded image production
US7466706B2 (en) 2000-09-18 2008-12-16 At&T Corp. Controlled transmissions across packet networks
US7551752B2 (en) 2004-04-26 2009-06-23 Graphic Security Systems Corporation Systems and methods for authenticating objects using multiple-level image encoding and decoding
US7634104B2 (en) 2003-06-30 2009-12-15 Graphic Security Systems Corporation Illuminated decoder
US7729509B2 (en) 2004-06-18 2010-06-01 Graphic Security Systems Corporation Illuminated lens device for use in object authentication
WO2013017590A1 (fr) 2011-08-03 2013-02-07 H.T.P.P. S.R.L. Procédé d'impression permettant d'effectuer une cryptographie, et équipement conçu selon ledit procédé
US9275303B2 (en) 2010-10-11 2016-03-01 Graphic Security Systems Corporation Method for constructing a composite image incorporating a hidden authentication image
WO2020084321A1 (fr) 2018-10-26 2020-04-30 De La Rue International Limited Appareils et procédés pour l'impression de documents de sécurité
GB2578962A (en) * 2018-09-27 2020-06-03 De La Rue Int Ltd Documents and methods of manufacture thereof
US11200470B2 (en) 2019-11-29 2021-12-14 Schreiner Group Gmbh & Co. Kg Method for checking a surface of an object, which surface is imprinted and/or structured in raster shape, and an object
US12017469B2 (en) 2018-10-26 2024-06-25 De La Rue International Limited Apparatuses and methods for printing security documents

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US4168088A (en) * 1977-12-15 1979-09-18 Burroughs Corporation Protected document and method of making the same
US4175774A (en) * 1978-03-23 1979-11-27 American Standard Inc. Non-copying printed document and method of printing same
GB2191733A (en) * 1986-06-17 1987-12-23 Norprint Int Ltd Security system for tickets or labels
EP0806706A1 (fr) * 1996-05-10 1997-11-12 Kalamazoo Computer Group Plc Améliorations aux mesures d'antiphotocopiage

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US4168088A (en) * 1977-12-15 1979-09-18 Burroughs Corporation Protected document and method of making the same
US4175774A (en) * 1978-03-23 1979-11-27 American Standard Inc. Non-copying printed document and method of printing same
US4175774B1 (fr) * 1978-03-23 1987-04-28
GB2191733A (en) * 1986-06-17 1987-12-23 Norprint Int Ltd Security system for tickets or labels
EP0806706A1 (fr) * 1996-05-10 1997-11-12 Kalamazoo Computer Group Plc Améliorations aux mesures d'antiphotocopiage

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7869437B2 (en) 2000-09-18 2011-01-11 At&T Intellectual Property Ii, L.P. Controlled transmissions across packet networks
US7466706B2 (en) 2000-09-18 2008-12-16 At&T Corp. Controlled transmissions across packet networks
WO2003067892A1 (fr) 2002-02-08 2003-08-14 Ascent Systems Software Limited Procede d'incorporation d'une image secondaire dans une image primaire
US7512248B2 (en) 2002-02-08 2009-03-31 Nautilus (Gb) Limited Method of incorporating a secondary image into a primary image
US6985607B2 (en) 2003-03-27 2006-01-10 Graphic Security Systems Corporation System and method for authenticating objects
US7634104B2 (en) 2003-06-30 2009-12-15 Graphic Security Systems Corporation Illuminated decoder
US7226087B2 (en) 2003-09-05 2007-06-05 Graphic Security Systems Corporation System and method for authenticating an article
US6980654B2 (en) 2003-09-05 2005-12-27 Graphic Security Systems Corporation System and method for authenticating an article
US7421581B2 (en) 2003-09-30 2008-09-02 Graphic Security Systems Corporation Method and system for controlling encoded image production
US7551752B2 (en) 2004-04-26 2009-06-23 Graphic Security Systems Corporation Systems and methods for authenticating objects using multiple-level image encoding and decoding
US7729509B2 (en) 2004-06-18 2010-06-01 Graphic Security Systems Corporation Illuminated lens device for use in object authentication
US9275303B2 (en) 2010-10-11 2016-03-01 Graphic Security Systems Corporation Method for constructing a composite image incorporating a hidden authentication image
WO2013017590A1 (fr) 2011-08-03 2013-02-07 H.T.P.P. S.R.L. Procédé d'impression permettant d'effectuer une cryptographie, et équipement conçu selon ledit procédé
GB2578962B (en) * 2018-09-27 2022-02-23 De La Rue Int Ltd Documents and methods of manufacture thereof
US11458753B2 (en) 2018-09-27 2022-10-04 De La Rue International Limited Documents and methods of manufacture thereof
GB2578962A (en) * 2018-09-27 2020-06-03 De La Rue Int Ltd Documents and methods of manufacture thereof
US12017469B2 (en) 2018-10-26 2024-06-25 De La Rue International Limited Apparatuses and methods for printing security documents
US20220118789A1 (en) * 2018-10-26 2022-04-21 De La Rue International Limited Apparatuses and methods for printing security documents
WO2020084320A1 (fr) 2018-10-26 2020-04-30 De La Rue International Limited Appareils et procédés pour l'impression de documents de sécurité
GB2580478B (en) * 2018-10-26 2022-10-12 De La Rue Int Ltd Apparatuses and methods for printing security documents
US11660896B2 (en) 2018-10-26 2023-05-30 De La Rue International Limited Apparatuses and methods for printing security documents
WO2020084321A1 (fr) 2018-10-26 2020-04-30 De La Rue International Limited Appareils et procédés pour l'impression de documents de sécurité
US11200470B2 (en) 2019-11-29 2021-12-14 Schreiner Group Gmbh & Co. Kg Method for checking a surface of an object, which surface is imprinted and/or structured in raster shape, and an object

Also Published As

Publication number Publication date
AU2001256492A1 (en) 2001-11-26
GB0011751D0 (en) 2000-07-05

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