Patent Publication Number: US-11383154-B2

Title: Enhanced security instant tickets via homogeneous utilization of the backing for variable indicia inks or dyes

Description:
PRIORITY CLAIM 
     This application is a continuation-in-part of, claims priority to, and the benefit of U.S. patent application Ser. No. 16/249,572, filed Jan. 16, 2019, which is a continuation of, claims priority to, and the benefit of U.S. patent application Ser. No. 15/189,483, filed Jun. 22, 2016, now U.S. Pat. No. 10,183,213, issued Jan. 22, 2019, which claims priority to and the benefit of U.S. Provisional Patent Application No. 62/286,713, filed Jan. 25, 2016, the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     The present disclosure relates generally to documents, such as lottery tickets, having variable indicia under a Scratch-Off-Coating (SOC), and more particularly to methods for enhancing the security of the documents while also adding to the aesthetics of the documents. Specifically, various embodiments of the present disclosure resolves the problem of securing variable indicia hidden under an intact SOC from various nefarious compromising methods (e.g., chemical diffusion, fluorescence, etc.) applied to the opposite side of the substrate from the variable indicia to determine the identity of the variable indicia while the document appears to remain pristine. 
     Lottery scratch-off or instant games have become a time-honored method of raising revenue for state and federal governments the world over. Indeed, the concept of hiding variable indicia information under a SOC has also been applied to numerous other products such as commercial contests, telephone card account numbers, gift cards, etc. Lottery game variable indicia are the letters, numbers, images, or other indicia which determine whether a ticket is a winner typically by identically matching two or more of the same letters, numbers, images, or other symbols that are part of the variable indicia under the SOC. Literally, billions of scratch-off products are printed every year where the SOCs are used to ensure that the product has not been previously used, played, or modified. 
     The variable indicia are often printed using a specialized high-speed ink jet with a water-soluble dye imaged on top of fixed plate or cylinder printed (e.g., flexographic, gravure, etc.) security layers that provide lower layer opacity, chemical barriers, and a higher contrast background for the ink jet variable indicia. The lower printed barriers therefore securing the variable indicia from compromise attacks originating through the back of the ticket or document. On top of the variable indicia there are printed a series of SOCs that include upper opacity and chemical barriers configured to provide countermeasures to compromise attacks originating on the same side of the ticket or document as the variable indicia. With both the upper and lower security ink film layers, the purpose is to ensure that the printed variable indicia cannot be read or decoded without first removing the associated SOC thereby ensuring that a game or product is secure against picking out winners or extracting confidential information from unsold tickets or documents. 
     However, there are known methods (e.g., wicking, vapor, steam, alcohol soaks, etc.) for diffusing the ink jet variable indicia either through the substrate backing or the front SOC. When carefully applied, these methods can temporally reveal the previously hidden variable indicia, thereby enabling illicit people to determine if a given ticket is a winner or non-winner while leaving little or no trace thereby selling only losing tickets or compromised documents to the public. The pick-out of variable indicia is ultimately made possible by a positive Signal-to-Noise (S/N) ratio of the diffused ink jet image through the substrate or the SOC relative to the ticket&#39;s background ink noise. 
     In addition to diffusion, techniques have been developed for inducing fluorescence in the ink jet variable indicia dye. In these fluorescence attacks the variable indicia dye is made to fluoresce with the ticket background not emitting any light or light in a different wavelength than the fluorescing variable indicia ink jet image. Since the variable indicia emits fluorescent light in a wavelength different from the excitation source and the ticket background, there is a relatively high S/N ratio established between the fluorescence emissions of the variable indicia and the background noise. This relatively high S/N ratio enables filtered (i.e., using a narrow band optical filter only allowing fluorescent wavelength light to pass) extended timed exposures with digital cameras that can successfully capture variable indicia images through an intact SOC or ticket backing that are not discernable by the human eye. This again enables illicit pick-out of winning tickets with only losing tickets being sold to an unsuspecting public. 
     Similar to the above diffusion and fluorescence techniques, electrostatic charges have also been applied to instant tickets with intact SOCs creating a differential charge in the hidden ink jet variable indicia. At this point, if an electrostatically sensitive powder (e.g., baby powder) is applied over the SOC or ticket backing, the powder will align in the two-dimensional shape of the (previously) hidden variable indicia yet again enabling the underlying variable indicia to be viewed even though the SOC remains pristine. When the charge is removed and the powder is brushed away, no indication remains that the ticket&#39;s integrity was compromised. The electrostatic attack is based on establishing a positive S/N ratio of the ink jet variable indicia&#39;s charge relative to the ticket&#39;s background ink noise. 
     All of these variable indicia compromise techniques have been mitigated to date with elaborate countermeasures meticulously developed in the instant ticket industry over decades. Most of these countermeasures rely on various printed (via a fixed plate or cylinder—i.e., non-variable) chemical barriers to resist the aforementioned attacks. The general concept being to secure the variable ink jet indicia image with barrier layers, thereby reducing the variable indicia&#39;s S/N ratio to near unity or below relative to the ticket&#39;s background unless the SOC has been removed (i.e., scratched off). However, these added barrier security layers have the disadvantage of added costs, reduced aesthetics, intermittent failures, laborious testing and verification, and potential susceptibility to new attack methodologies. 
     BRIEF SUMMARY 
     This disclosure relates to a security-enhanced document with a removable SOC, which may be an instant lottery ticket in certain embodiments. The document includes any manner of suitable substrate, with the variable indicia remaining unreadable via diffusion, fluorescence, or electrostatic attacks until the associated SOC layer is legitimately removed. 
     Various embodiments of the present disclosure relate to a security-enhanced document comprising a substrate, variable indicia, at least one other printed portion creating background noise, and a SOC layer applied over the variable indicia to maintain the variable indicia unreadable until the SOC is removed by being scratched off, the variable indicia comprising ink having a measurable Signal-to-Noise ratio relative to the background ink noise of the document&#39;s at least one other printed portion, such that the variable indicia are undiscernible with reference to the at least one other printed portion while the SOC remains intact. For the present disclosure, the measurable Signal-to-Noise can be determined, for instance, when subjected to diffusion, fluorescence, or electrostatic charges. 
     In various embodiments, the variable indicia and the at least one other printed portion are printed with a printing technique with inks selected from the group including ink jet printing (either dye or pigmented based), thermal transfer and/or xerography, phaser, or laser exposure. In various embodiments, the variable indicia and at least one other printed portion are printed with the same ink chemical composition and in certain embodiments using the same application technique. 
     In certain embodiments, the variable indicia are imaged using the same type of ink as the front display portion or area (i.e., decorative portion printed on the same side or plane as the variable indicia, but the display portion is not covered by the SOC) of the document providing a common printed foundation for both the display and variable indicia portions, thereby greatly reducing the variable indicia&#39;s S/N ratio relative to the ticket&#39;s display background from the perspective of the front side of the ticket or document so long as the SOC remains intact. Unlike prior art barrier chemistry countermeasures, this embodiment has the advantage of reducing the variable indicia&#39;s S/N ratio relative to the front of the document&#39;s display portion under virtually any circumstances, rather than only for specified attacks. 
     In certain embodiments, the variable indicia are imaged using the same type of ink as the overprint portion or area (i.e., decorative portion, printed on top of the SOC) of the document providing common printed films for both the variable indicia and the SOC itself. Again, this embodiment greatly reduces the variable indicia&#39;s S/N ratio relative to the scratch-off area so long as the SOC remains intact. 
     In certain embodiments, the document&#39;s backing is imaged (i.e., back printing) using the same type of ink as the variable indicia, thereby reducing the variable indicia&#39;s S/N ratio to the document&#39;s backing when measured from the rear of the substrate. With certain such embodiments, the portion of the document&#39;s backing that is positioned directly behind the variable indicia exhibits a minimum coverage and dispersion using the same type of ink as the variable indicia. 
     In various embodiments, the common display, overprint, and backing applications relative to the variable indicia can be combined in various manners further reducing the variable indicia&#39;s S/N ratio relative to the document&#39;s background. 
     In various of these embodiments, the variable indicia can be imaged on a security ink film layer (e.g., blocking layer for opacity) or imaged directly on the document&#39;s substrate (assuming sufficient opacity can be achieved by other means). Various embodiments of the present disclosure utilize common materials and application techniques for both the document&#39;s variable indicia and other portions (i.e., display, overprint, and/or backing areas) so that tampering can be readily discerned. 
     Described are a number of printing mechanisms and methodologies that provide practical details for reliably producing secure variable indicia under a SOC that is highly resistant to various pick-out techniques based on the differences between the variable indicia and other portions of the document. Although the examples provided herein are primarily related to instant tickets, it is clear that the same methods are applicable to any type of document (e.g., telephone card, gift card) where information is protected by a SOC. 
    
    
     
       BRIEF DESCRIPTION OF THE OF SEVERAL VIEWS OF THE DRAWINGS 
       The foregoing summary, as well as the following detailed description of this disclosure, will be better understood when read in conjunction with the appended drawings. It should be understood, however, that this disclosure is not limited to the precise arrangements and instrumentalities shown. In the drawings: 
         FIG. 1  is an exploded top isometric view of a representative example of a prior art traditional lottery-type instant ticket security ink film stack where the variable indicia is applied as a separate process and ink film; 
         FIG. 2A  is an exploded top isometric view of the traditional prior art lottery-type instant ticket security ink film stack of  FIG. 1  under a diffusion attack through the front overprint layers; 
         FIG. 2B  is an exploded top isometric view of the traditional prior art lottery-type instant ticket security ink film stack of  FIG. 1  under a diffusion attack through the back of the ticket&#39;s substrate; 
         FIG. 3A  is a partially exploded top isometric view of the prior art traditional lottery-type instant ticket security ink film stack of  FIG. 1  under a fluorescence attack through the front overprint layers; 
         FIG. 3B  is a partially exploded top isometric view of the prior art traditional lottery-type instant ticket security ink film stack of  FIG. 1  under a fluorescence attack through the back of the ticket&#39;s substrate; 
         FIG. 4A  is an exploded top isometric view of a first representative example of a modified lottery-type instant ticket security ink film stack utilizing variable indicia homogenized with the ticket display area and overprint area according to the present disclosure; 
         FIG. 4B  is an exploded back isometric view of a first representative example of a modified lottery-type instant ticket utilizing variable indicia homogenized with the ticket back area according to the present disclosure; 
         FIG. 4C  is an exploded back isometric view of a second representative example of a modified lottery-type instant ticket utilizing variable indicia homogenized with the ticket back area according to the present disclosure; 
         FIG. 5A  is a partially exploded top isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4A  utilizing variable indicia homogenized with the ticket display and overprint under a diffusion attack through the front overprint layers; 
         FIG. 5B  is a partially exploded back isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4B  utilizing variable indicia homogenized with the ticket back imaging under a diffusion attack through the back of the ticket&#39;s substrate; 
         FIG. 5C  is a partially exploded back isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4C  utilizing variable indicia homogenized with the ticket back imaging under a diffusion attack through the back of the ticket&#39;s substrate; 
         FIG. 6A  is a partially exploded top isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4A  utilizing variable indicia homogenized with the ticket display and overprint under a fluorescence attack through the front overprint layers; 
         FIG. 6B  is a partially exploded back isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4B  utilizing variable indicia homogenized with the ticket back imaging undergoing a fluorescence attack through the back of the ticket&#39;s substrate; 
         FIG. 6C  is a partially exploded back isometric view of the modified lottery-type instant ticket security ink film stack of  FIG. 4C  utilizing variable indicia homogenized with the ticket back imaging undergoing a fluorescence attack through the back of the ticket&#39;s substrate; 
         FIG. 7A  is a schematic view of a first representative example of a digital press configuration capable of printing the modified lottery-type instant ticket security ink film stack of  FIGS. 4A  thru  4 C; and 
         FIG. 7B  is a schematic view of a second preferred representative example of a digital press configuration capable of printing the modified lottery-type instant ticket security ink film stack of  FIGS. 4A  thru  4 C. 
     
    
    
     DETAILED DESCRIPTION 
     As used herein, the words “image” or “print’ are used equivalently and mean that whatever indicium or indicia is or are created directly or indirectly on any surface may be done by any known imaging or printing method or equipment. Likewise, “imaging” or “printing” describing a method and “imaged” or “printed” describing the resulting indicium or indicia are used equivalently and correspondingly to “image” or “print.” Similarly, the term “ink jet” while typically meaning a digital printer in which droplets of ink are sprayed onto a surface to create an image, may also refer generically to other means of digitally printing an image on a substrate (e.g., laser printing, solid ink printing, monochromatic ink jet, process color ink jet) in the context of this disclosure. 
     Certain terminology is used herein for convenience only and is not to be taken as a limitation on the present disclosure. The words “a” and “an”, as used in the claims and in the corresponding portions of the specification, mean “at least one.” The terms “scratch-off game piece” or other “scratch-off document,” hereinafter are referred to generally as an “instant ticket” or simply “ticket.” Additionally, the terms “full-color” and “process color” are also used interchangeably throughout the specification and claims as terms of convenience for producing a variety of colors by discrete combinations of applications of pigmented primary inks or dyes “CMYK” (i.e., Cyan, Magenta, Yellow, and Black), or in some cases six colors (e.g., Hexachrome printing process uses CMYK inks plus Orange and Green inks), or alternatively eight colors—e.g., CMYK plus lighter shades of cyan (LC), magenta (LM), yellow (LY), and black (YK). 
     Also, as used herein, the terms “multi” or “multiple” or similar terms means at least two, and may also mean three, four, or more, for example, unless otherwise indicated in the context of the use of the terms. Also, “variable” indicium or indicia refers to imaged indicum or indicia that indicates information relating a property, such as, without limit a value of the document, for example, a lottery ticket, coupon, commercial game piece or the like, where the variable indicium or indicia is or are typically hidden by a SOC until the information or value is authorized to be seen, such as by a purchaser of the document who scratches off the SOC, revealing the variable indicium or indicia. Examples of variable indicium as a printed embodiment include letters, numbers, icons, barcodes, figures, etc. 
     The term “Signal-to-Noise ratio” or “S/N ratio” as used herein refers to a signal generated from an indicium or indicia such as when subjected to diffusion, fluorescence, or electrostatic charges, and of sufficient level for an illicit attacker to specifically discern the indicium or indicia relative to the level of the ticket or document&#39;s background noise or entropy—e.g., a S/N ratio greater than 1:1 (greater than 0 dB or “0 decibel”). In other words, in the context of this disclosure, the S/N of a given indicum or indicia relative to the background noise or entropy is used in the information theory sense of the term where the “entropy” of the system is the total number of possible types of indicia distributed across the ticket or document&#39;s population in a typically ergodic fashion with the “signal” being generated by the particular indicium or indicia under attack (e.g., fluorescence emission, diffused chemical traces, electrostatic attraction) and the noise typically being generated by the countermeasures added to the ticket or document or natural effects. 
     Finally, in the context of this disclosure, the term “variable imaging,” refers to methods of printing from a digital-based image directly to a variety of documents having a SOC (e.g., instant lottery ticket). Thus, as its name implies, “variable imaging” can vary from document-to-document and may include text, icons, drawings, photographs, etc. Any of the commercially available off-the-shelf digital printers (e.g., Memjet, Hewlett Packard or “HP” Indigo, Xerox CiPress series, Kodak) are capable of printing the “variable imaging” as described by this disclosure. 
     Before describing the present disclosure, it is useful to first provide a brief description of the current state of the art of instant ticket production and validation (in addition to the explanation in the above background section). The concept is to ensure that a common lexicon is established of existing prior art systems prior to describing the present disclosure. This description of the current state of the art of instant ticket production and validation is provided in the discussions regarding  FIGS. 1 through 3B . 
       FIG. 1  depicts a representative example of the variable indicia and associated security ink stack typical of a traditional ink jet SOC secured document—i.e., an instant lottery ticket  100 . As shown in  FIG. 1 , the printed variable indicum  104  is between lower security ink films  102  and  103  and upper security ink films  105 ,  106 , and  107  providing chemical barriers potentially protecting the variable indicum  104  from diffusion, fluorescence, electrostatic, and other known attacks. The entire ink film stack is deposited on a paper, foil, or other substrate  101 . The lower security-ink film layers include optional layer  102  (not required for a foil substrate) providing opacity and diffusion barriers, as well as at least one higher contrast (e.g., white or gray against a black or other dark color) layer  103  so that a human consumer can read the variable indicum  104 . The upper security ink film layers also isolate the variable indicum  104 , first with a release coating  105  that helps seal the variable indicia to the substrate  101  and lower ink film layers as well as causing any ink films printed on top of the release coating  105  to scratch-off. The SOC comprises one or more layers, and typically several, so that the variable indicum  104  is not visible until the ticket is played by the SOC being legitimately scratched-off. The SOC layer of exemplary ticket  100  comprises at least one upper opacity layer  106  that is applied to help protect against candling and fluorescence attacks. On top of the opacity layer(s), at least one white ink film  107  layer is typically applied that provides a higher contrast background for overprint inks. Finally, decorative overprint ink areas or layers  108  and  109  are applied for both an attractive appearance of the SOC area, as well as sometimes providing additional security. In addition to the security ink stack and variable indicia of portions of ticket  100 , the ticket also has printed decorative display area layers  110  through  113  configured to make the ticket  100  more attractive and possibly provide instructions for game play. The printed ink film “layers” mentioned herein may be applied in any form and in any image and with multiple applications. Thus, ink film “layers” as used herein is equivalent to “areas” or “portions” of the ticket. Typically, the display area printing is printed as an offset or flexographic (i.e., fixed printing plate) process color in which four primary printing colors Cyan  110 , Magenta  111 , Yellow  112 , and Black  113  (a.k.a., “CMYK”) are blended in varying intensity to mimic colors perceived by a human eye. However, other printing processes and techniques may be used if desired. 
     Thus, a large number of security ink film layers (seven in the example of  FIG. 1 ) are required to protect and allow for only legitimate consumer readability of the variable indicum  104  of a properly played or scratched-off prior art SOC protected document, such as an instant lottery ticket. Of course, the example of  FIG. 1  is just one possible arrangement of a prior art SOC protected document with security ink film layers, with the goal of any security ink film layer arrangement being to provide barriers to outside attempts to discern the variable indicum or indicia without properly removing the SOC. 
     These security ink film layers have been highly evolved to provide security countermeasures against various diffusion, fluorescence, electrostatic, and other attacks as they became known to the industry. Thus, the barriers are highly tuned to known attacks and not necessarily helpful against new attacks that utilize previously unknown agents or excitation wavelengths. The industry typically modifies these highly tuned and complex security barriers only when a new attack becomes apparent in the art. 
     For example,  FIG. 2A  illustrates a diffusion attack on an instant ticket  200  where a solvent  202  that was selected to diffuse the chemistry of the ink jet variable indicia  104 , such that when the solvent  202  is gently applied by an eye dropper  201 , the solvent  202  unobtrusively penetrates through the decorative overprints  108  and  109 , the white ink film  107 , the upper opacity layer  106 , and the release coat  105  without disturbing their chemical bond to the ticket  100 , the ink stack ( 102  through  109 ), or the substrate  101 , thereby enabling those layers to appear intact and undisturbed. If the solvent  202  is properly selected it will saturate an area  204  around the variable indicia  104  and cause a small portion of the variable indicia to diffuse through the upper security layers and the overprints ( 105  thru  109 ) to reveal a faint ghost image  203  of the underlying variable indicia  104 . As is typical of these types of attacks, once the ticket  200  is allowed to dry, the ghost image  203  typically disappears leaving virtually no trace that the ticket  200  was compromised for pick-out of the variable indicia  104  via diffusion. 
     This type of attack  200  relies on the ink jet variable indicum or indicia  104  of the prior art lottery ticket being comprised of a separate chemical composition than the upper ink layers ( 105  through  109 ) and possibly the lower security ink layers ( 102  and  103 ) and the display portion ( 110  through  113 ) as well as the ticket back printing on the opposite side of the substrate. This works because prior art traditional tickets typically employ an ink jet dye for printing the variable indicum or indicia  104  that is generally comprised of a chemistry that is substantially different than the security ink layers ( 102  through  103  and  105  through  107 ), overprint areas  108  and  109 , display areas  110  through  113 , and the ticket back printing. This is generally because the variable indicia  104  changes from ticket-to-ticket and the high volumes of scratch-off documents produced in a typical print run require the variable indicia to be printed at high speeds (e.g., 600 to 1,000 Feet Per Minute or “FPM”) and at as low a cost as possible to be economically feasible. When these considerations are combined the variable indica  104  along with the associated barcode and inventory control number (back of ticket substrate) are typically the only variable data printed on a ticket printed with the more expensive ink jet ink or dye. 
     Known diffusion attacks (e.g., alcohol) through the front of the ticket or document have been mitigated by attempting to make the security barriers impervious to solvents  202  of the ink jet variable indicum or indicia  104 . The upper release coat  105  in particular has become of increasingly exotic nature both in terms of chemistry and application. The current state-of-the-art is to cure the release coat with direct energy such as an electron beam in a controlled atmosphere or via Ultraviolet (UV) exposure. However, the possibility always remains that a new solvent may be discovered that penetrates these coatings and thereby defeats the existing countermeasures. In other words, so long as the materials and possibly application of the ink jet variable indica  104  remain different than the ticket&#39;s other ink film layers the chance always remains to achieve a S/N ratio sufficient to discern the variable indicum or indica  104  via a ghost image  203  without removing the SOC. 
     Of course, diffusion attacks may also be attempted in the opposite direction (i.e., through the back of the substrate  101  and the lower security coatings  102  and  103  of  FIG. 1 ) where the barrier seals may not be as sophisticated due to the high graphic adhesion requirements of the lower security coatings. For example,  FIG. 2B  illustrates an exemplary diffusion attack on the back of an instant ticket  200 ′ where a solvent  202 ′ was selected to combine with the chemistry of the ink jet variable indica  104  ( FIG. 2A ) such that when the solvent  202 ′ ( FIG. 2B ) is gently applied by an eye dropper  201 ′, the solvent  202 ′ unobtrusively penetrates through the ticket substrate  101 ′ and the lower security ink film layers (e.g.,  102  and  103  of  FIGS. 1 and 2A ) without disturbing the substrate  101 ′ ( FIG. 2B ) or the legal text  250  and barcode  251  typically on the back of the ticket, thereby enabling the ticket to appear pristine after the diffusion attack is allowed to dry. As illustrated in  FIG. 2B , in certain prior art tickets, the legal text  250  and the barcode  251  remain pristine simply because there is typically no effort in the prior art to ensure that legal text  250  and/or the barcode  251  overlay the opposite side of the ticket from the variable indicia. While the barcode  251  is typically imaged using the same ink chemistry and application technique as the variable indicia, it is normally not positioned on the opposite side of the ticket from the variable indicia (as shown in  FIG. 2B ) and consequently does not typically provide any security countermeasures to diffusion attacks. The legal text  250  is another matter, while it may or may not be positioned on the opposite side of the ticket from the variable indicia its positioning is typically irrelevant to serve as a countermeasure for diffusion attacks since, primarily for economic reasons, the legal text  250  is generally comprised of a completely different ink chemistry than the variable indicia and accordingly does not dissolve or diffuse under diffusion attacks through the back of the ticket that utilize a solvent  202 ′ configured for the variable indica. 
     The same concept of differing materials and applications for the variable indicia relative to the rest of the document enabling selective security attacks without removing the SOC can be applied to fluorescence and electrostatic attacks. In the special case of electrostatic attacks, the differential charge in the hidden variable indicia generally is usually neutralized using anti-static barriers typically comprising a conducting polymer (plastic) and a solvent made from deionized water and alcohol. When printing, the solvent evaporates, leaving behind an invisibly thin conducting film on the surface of the printed image that shields differential charge build-up, thereby providing a shield against most types of electrostatic attacks. However, since the variable indicia uses fundamentally different ink chemistry than the rest of the document, the possibility still remains that some charge differential may be found in the future using an unknown technique (e.g., higher voltage, differing polarity, alternating current imaging, etc.) that enables the variable indicia to be read without removal of the SOC. 
     Fluorescence attacks are yet another matter; the large numbers of potential excitation wavelengths that may induce fluorescence in differing wavelength(s) are literally in the hundreds of thousands. Also, the long molecular chains of Volatile Organic Compound (VOC) dyes (typical of variable indicia ink jet dye) tend to be susceptible to fluorescence over multiple excitation wavelengths. What is more, subtle variation in the chemistry of the ink used for the variable indicia may greatly alter its fluorescence characteristics, inadvertently causing emissions to occur with excitation wavelengths and fluorescence emission wavelengths previously thought to be secure. Given that the bandwidth of possible excitation and emission wavelengths is so large and that fluorescence attacks may be timed exposures over a narrow (i.e., fluorescence emission) bandwidth, it is extremely difficult to engineer reliable opacity blocking layers sufficient to ensure security over a large press run. The underlying problem is that timed exposures over a filtered narrow band centered about the fluorescence emission wavelength of the variable indicia enables an extremely small quantity of photons emissions from the variable indicia fluorescence transmitted through the upper or lower security layers to be collected over time, thereby enabling a sufficient S/N ratio to discern the variable indicia of a document with the SOC intact. 
     For example,  FIG. 3A  illustrates one possible method to induce sufficient fluorescence in the variable indicia  104  of a traditional prior art document or ticket  300  front that are covered by SOC security layers  105  through  107  and overprint layers  108  and  109  such that the variable indicia information may be ascertained while leaving the SOC pristine. In  FIG. 3A , an excitation light source  301  generates excitation photons of a desired wavelength  302  (e.g., λ=488 nm—blue light) in sufficient quantity and intensity to penetrate, albeit with attenuated photons  303 , the upper blocking SOC security layers  105  through  107 ) and overprint areas  108  and  109  thus inducing fluorescence  304  in the traditional prior art ink jet variable indicum or indicia  104 . Since the induced ink jet variable indicum or indicia fluorescence  304  will be a different and longer wavelength (e.g., λ=850 nm—Infrared or “IR” light), the lesser number of fluorescence photons that penetrate through the SOC security layers  105  through  107  and overprint areas  108  and  109  to radiate from the ticket or document&#39;s surface  306  potentially provide a large enough S/N ratio sufficient to produce an image  309  of the previously hidden variable indicum or indicia  104 , using a timed exposure camera where a bandpass optical filter  307  blocks the much more intense reflected excitation light source  305  only enabling the longer wavelength fluorescent light  308  to pass to the time exposure camera. In this example, any fluorescence exhibited by the display ( 110  thru  113 ) and/or overprint ( 108  and  109 ) will typically be of a different wavelength due to the display and overprint ink&#39;s different chemical composition from the variable indicum or indicia. 
     Like diffusion attacks, fluorescence attacks may also be attempted in the opposite direction (i.e., through the back of the substrate  101  and the lower security coatings  102  and  103  of  FIG. 1 ). For example,  FIG. 3B  illustrates an exemplary fluorescence attack on the back of an instant ticket  300 ′ where an excitation light source  301 ′ generates excitation photons of a desired wavelength  302 ′ in sufficient quantity and intensity to penetrate the ticket substrate  101 ′ and lower security layers ( 102  and  103  of  FIG. 1 ) thereby inducing fluorescence  306 ′ ( FIG. 3B ) in the traditional prior art ink jet variable indicia. Since the induced ink jet variable indicia fluorescence  306 ′ will be a different and longer wavelength, the lesser number of fluorescence photons that penetrate through the lower security layers and ticket substrate to radiate from the ticket or document&#39;s backing  306 ′ potentially still provide a large enough S/N sufficient to produce an image  309 ′ of the previously hidden variable indicum or indicia, using a timed exposure camera where an optical bandpass filter  307 ′ blocks the much more intense reflected excitation light source  305 ′ only enabling the longer wavelength fluorescent light  308 ′ to pass. 
     As illustrated in  FIG. 3B  there is again typically no effort in the prior art to ensure that legal text  250  and barcode  251  overlay the opposite side of the ticket from the variable indicum or indicia. The legal text  250  may or may not be positioned on the opposite side of the ticket from the variable indicum or indicia since it is typically comprised of a completely different ink chemistry than the variable indicia and accordingly does not naturally fluoresce (if at all) in the same wavelength as the variable indica. However, the barcode  251  is usually imaged using the same ink chemistry as the front variable indicia and consequently will fluoresce in the same wavelength as the variable indicia when exposed to the same excitation light source  302 ′ thereby greatly increasing the noise most likely to the point that the variable indicum or indicia cannot be ascertained. Unfortunately, assuming the barcode is not directly positioned over the opposite side of the ticket from the variable indicum or indicia (as shown in  FIG. 3B ) its fluorescence noise source can be eliminated by simply covering the barcode  251  with an opaque object  310  (e.g., strip of sheet metal, tape). Even if the barcode is positioned directly over the opposite side of the ticket from the variable indicum or indicia the relatively narrow shape and size of the barcode when compared to the typically much larger area occupied by variable indicia (i.e., the variable indicia is human readable and discloses the win or lose game status of each ticket, consequently the variable indicia typically occupies a significant percentage of the ticket&#39;s front surface with the back printed machine readable “overhead” barcode and human readable inventory number typically only occupying an area around 1 to 2 inches wide and 0.5 inch tall) would at best provide a security countermeasure to only a small portion of the variable indicia or perhaps a single variable indicum which typically would not suppress sufficient prize information to serve as an effective countermeasure. 
     Reference will now be made in detail to examples of the present disclosure, one or more embodiments of which are illustrated in the drawings. Each example is provided by way of explanation of the disclosure, and not meant as a limitation of the disclosure. For example, features illustrated or described as part of one embodiment, may be used with another embodiment to yield still a further embodiment. It is intended that the present disclosure encompasses these and other modifications and variations thereof within the scope and spirit of the disclosure. 
     All of these previous disclosed types of attacks (i.e., diffusion, electrostatic, and fluorescence) exploit the different types or chemistries of ink of the variable indicum or indicia  104  (typically ink jet dye) relative to the rest of the ink used in the prior art document or lottery ticket  100  (see  FIG. 1 ) to obtain sufficient S/N to discern the variable indicum or indicia without removing the SOC. However, any differences between the materials of the variable indicum or indicia and the display, overprint, or back areas of a document or ticket are typically eliminated with this disclosure of utilizing the same ink to print the variable indicum or indicia and display, overprint, and/or backing areas. In other words, imaging the SOC overprints and the ticket back with the same ink chemistry as the variable indicum or indicia enhance the commonality of the ticket or document. Thus, by utilizing common, (also called homogenous) materials over at least other portions of the document or ticket as well as the variable indicum or indicia typically eliminates any attempt to garner a sufficient S/N ratio of the variable indicum or indicia ink relative to the rest of the document&#39;s background noise to discern the hidden variable indicum or indicia. 
       FIG. 4A  provides an embodiment of an exploded front isometric view of a modified document utilizing secure variable indicia  410  according to the present disclosure in the form of an exemplary lottery-type instant ticket  400 . The ticket includes a substrate  401  having at least one lower opacity security ink film  402  layer with at least one higher contrast security ink film layer  403  applied below the variable indicia  410 . With this exemplary embodiment, an ink jet primer  404  may be optionally flood coated over both the lower security area(s) and the remainder of the document&#39;s front surface. Next, the variable indicia  410  and preferably the front display portion  411  are applied as a homogeneous ink film layer  405  across the front of the document. Covering the variable indicia portion  410  is at least one clear release coat layer  406  that is direct energy cured (e.g., electron beam, ultraviolet) providing an initial transparent protective ink film coating that will cause all subsequent applied ink films to scratch-off—i.e., Scratch-Off Coatings or “SOC”. At least one upper opacity coating layer  407  is then applied on top of the release coat layer  406  with at least one high contrast white primer ink film layer  408  printed on top of the at least one upper opacity coating layer  407 . Finally, a decorative overprint layer  409  is applied on top of the SOC coatings with the same ink chemistry that was used to print the variable indicia  410 . 
     Thus, the embodiment of  FIG. 4A  illustrates the variable indicia  410  and ticket display  411  printed as part of the same homogenous process color digital imager layer  405  on the lottery-type instant ticket  400 . For the purposes of this embodiment, the type of digital imager ink or material (e.g., toner based, thermal transfer, pigmented ink jet, dye based ink jet, etc.) and the method or technique of applying the homogenous variable indicia  410  and display  411  ink film layer  405  to the ticket  400  is irrelevant; the disclosure is that the variable indicia  410  and display area  411  layer are to be applied with the same ink chemistry. Since the resulting homogenous ink film layer  405  comprises both the variable indicia  410  and the display  411  portions there can no longer be any significant S/N ratio derived from differences between the variable indicia  410  and the display  411  portions. Therefore, the underlying concept of diffusion, electrostatics, and fluorescence attacks exploiting a positive S/N ratio of the variable indicia ink  410  relative to the ticket display  411  background ink noise predictably becomes no longer possible. In other words, whatever attack that attempts to exploit any unique characteristic of the variable indicia  410  will also extract the same characteristic from the display area noise with no significant S/N ratio possible. This reduction of variable indicia  410  signal relative to the ticket&#39;s  400  background noise can be further enhanced by imaging the overprint area layer  409  with the same process color digital imaging inks that were used to generate the variable indicia  410  and optionally the display  411  portion. 
     As its name implies, the overprint  409  is printed after the variable indicia  410  on top of SOC layers  407  and  408  and therefore cannot be imaged at the same time as the variable indicia  410 . However, by digitally imaging the overprint  409  portion with the same materials (ink) as the variable indicia  410 , the same effect of eliminating any intelligible variable indicia S/N ratio relative to the remainder of the ticket  400  noise is achieved, especially for attacks (e.g., fluorescence, electrostatics, diffusion) that physically transverse the SOC. 
     In an alternative embodiment, the display portion  411  can be optionally imaged with the same application as the overprint portion  409 , providing a homogeneous ink film layer encompassing the overprint portion  409  and the display portion  411  with the variable indicia  410  being printed with the same ink(s) albeit by a different (prior) application. In certain applications this alternative embodiment may be preferred where it is desirable to ensure that the overprint portion  409  and display portion  411  graphics seamlessly blend together and may also provide a countermeasure to unassisted and assisted SOC lifting techniques where the SOC is temporally “lifted” by a mechanical mechanism, which enable the underlying variable indicia to be observed and then the SOC rolled back into position with an adhesive thus making the document or ticket to appear uncompromised. This alternative embodiment would provide a countermeasure to these unassisted and assisted SOC mechanical lift attacks by eliminating any clear demarcation between the overprint area  409  and display area  411  with any mechanical lift attempt disrupting the homogenous overprint area  409  and display area  411 . This disruption in image effect can be enhanced by including fine lines and/or other micro-printing around the boundary between the overprint area  409  and display area  411 . 
     The variable indicia may also be homogeneous with other portions of the ticket or document including any imaging located on the ticket&#39;s back. For example,  FIG. 4B  illustrates an embodiment  400 ′ where the portion of the back of the ticket&#39;s substrate  401 ′ that overlays the opposite side of the ticket from the variable indicia  410 ′ is intentionally printed with legal text  426  with the same ink as the variable indicia resulting in a generally uniform heterogeneous coverage of the backing overlapping variable indicia area—i.e., legal text ink uniformly distributed across the overlapping variable indicia area. Thus, with embodiment  400 ′ the generally uniform heterogeneous coverage of legal text  426  is also digitally imaged using the same ink chemistry as the variable indicia  410 ′, thereby creating a homogeneous countermeasure across the ticket or document&#39;s back  401 ′ which overlaps the variable indicia  410 ′. As with the previously discussed homogeneous overprint countermeasure  409 ′, by uniformly covering the back of the ticket portion that overlaps the variable indicia with digitally imaged legal text  426  comprised of the same materials (ink) as the variable indicia  410 ′, the same effect of suppressing any intelligible variable indicia signal relative to the ticket  400 ′ noise is achieved, especially for attacks (e.g., fluorescence, electrostatics, diffusion) that physically transverse the back of the ticket. Preferably, a primer coating  425  is flood coated over the back of the substrate  401 ′ prior to any homogeneous legal text imaging. Of course, the barcode  427  would also be digitally imaged with the same materials (ink) as the variable indicia  410 ′ and thereby add to the increasing of the noise floor countermeasure, but as previously described the barcode  427  by itself does not cover a large enough area to provide the generally uniform homogeneous coverage across the entire overlapping area of the variable indicia  410 ′ and consequently as also previously described can be easily thwarted. 
     Thus, the size, amount, and the uniformity of the distribution of the homogeneous coverage of the overlapping variable indicia back area impacts the effectiveness of increasing the noise floor countermeasure through the ticket back. Generally, coverage of the overlapping variable indicia back area should be uniformly spread—e.g., ≤0.25 inch or ≤6.35 mm white spacing (i.e., no ink printed) between imaging when mean averaged—over at least 50% of the overlapping variable indicia back area. In various embodiments, at least 20% of the at least 50% overlapping variable indicia  410 ′ back area should contain the same materials (ink) as the variable indicia  410 ′. In certain embodiments, imaging legal text  426  that is ≤18-point font with the same ink chemistry as the variable indicia over at least 50% of the overlapping variable indicia  410 ′ back area will meet this requirement—e.g., a 10-point legal text overlay equates to 0.1 inch or 2.54 mm worst case mean average spacing. Alternatively, if the variable indicia  410 ′ are imaged in process colors, imaging the ticket back legal text  426  in “rich black” (e.g., 100% cyan, 100% magenta, 100% yellow, and 100% black) will have the advantage of theoretically providing a higher level of security since all of the process colors&#39; ink chemistry will be present in the legal text  426  with the disadvantage of higher costs due to increased ink consumption. Therefore, with at least 50% of the overlapping variable indicia  410 ′ back area uniformly covered with homogeneous digital imaging, the prior art nefarious fluorescence attack technique disclosed in  FIG. 3B  of simply covering ticket back digital imaging with an opaque object  310  (e.g., strip of sheet metal, tape) to eliminate florescence noise will be ineffective since the covering would also block any underlying signal from the variable indicia  410 ′ ( FIG. 4B ) due to the reverse side minimum 50% coverage requirement. 
     While strategically placing the legal text  426  over at least 50% of the overlapping variable indicia  410 ′ back area provides adequate homogeneous security countermeasures for most ticket configurations, there are variable indicia layouts associated with larger tickets (e.g., ≥6×4 inches or ≈15.2×10.2 cm) where the overlapping variable indicia  410 ′ back area is simply too large and/or the overlapping variable indicia  410 ′ back area is segmented into different portions. With these types of ticket configurations, it is preferred to include at least one additional homogeneous digital imaging portion on the back of the ticket. For example,  FIG. 4C  shows the same exploded rear isometric view  400 ″ of the modified ticket of  FIG. 4B  with secure variable indicia  410 ′ ( FIG. 4C ) imaged on the front side of the substrate  401 ′ with legal text  426 ′ and the barcode  427 ′ overlapping the variable indicia  410 ′ back area. However, in  FIG. 4C  there is an additional homogeneous digitally imaged display portion  428  also imaged in the overlapping variable indicia  410 ′ back area. The exact configuration of the additional homogeneous digitally imaged display portion  428  is irrelevant in various embodiments because the concept is to provide coverage of the overlapping variable indicia  410 ′ back area(s) in addition to or instead of the legal text  426 ′. As illustrated in  FIG. 4C  the additional homogeneous digitally imaged display portion  428  is imaged partially transparent (e.g., 33% opacity as shown in  FIG. 4C ) to ensure sufficient contrast for the legibility of any overlapping legal text  426 ′. The additional homogeneous digitally imaged display portion  428  is not extended to the general area surrounding the barcode  427 ′ to ensure high read rates. 
     When the homogenized embodiments of the document or ticket  400 ,  400 ′, and  400 ″ of  FIGS. 4A  thru  4 C are subjected to a diffusion attack, in various embodiments, no significant S/N of the ticket variable indicia  410  and  410 ′ can be discerned thereby ensuring that the ticket remains secure so long as the SOC remains intact. For example,  FIG. 5A  depicts the homogenized embodiment of  FIG. 4A  under a diffusion attack  500  ( FIG. 5A ) through the overprint and SOC similar to  FIG. 2A . With the embodiment  500  of  FIG. 5A , the eyedropper  501  applies solvent  502  selected to attack the ink of the variable indicia  410 . However, in the embodiment of  FIG. 5A , the solvent  502  applied simultaneously attacks both the overprint area  409  as well as the variable indicia  410  resulting in a surface area  504  that dissolves and combines both the overprint area  409  and variable indicia  410 . This results in a blurred image that does not carry a sufficient S/N ratio of the variable indicia ink relative to the overprint area ink to discern the variable indicia. Additionally, by having the surface overprint area  409  printed with the same materials (ink) as the variable indicia  410  any solvent sufficiently powerful to draw the variable indicia through the upper security layers  406  thru  408  would also normally irrevocably alter the overprint area  409 , such that the tampering by diffusion would be readily apparent and the ticket could no longer be sold as pristine. 
     When the same embodiment of the ticket  400  of  FIG. 4A  is subjected to tampering by diffusion from the back side of the ticket  500 ′ as shown in  FIG. 5B  a similar homogeneous countermeasure result occurs  527 . The legal text  426  (comprised of the same chemical composition as the variable indicia  410 ′) that overlaps the variable indicia  410 ′ back area of the ticket naturally responses to the diffusion attack, where a solvent  526  is gradually dispersed from an eye dropper  525 , with the legal text  426  melting into whatever variable indicia  410 ′ is diffused through the substrate  401 ′ such that there is no appreciable S/N level derived from the variable indicia  410 ′ with the information inherent in the variable indicia  410 ′ not being discerned and probably the legal text itself becoming irrevocably altered such that the tampering by diffusion would be readily apparent and the ticket could no longer be sold as pristine. 
     With the homogenized embodiment  500 ″ of  FIG. 5C  the S/N becomes even lower due to the added translucent display layer  428  comprised of the same chemical composition (ink) as the variable indicia  410 ′ being added in addition to the legal text  426 ′ (such as by the same application). Thus, the solvent  526 ′ slowly dispensed from an eye dropper  525 ′ results in an even more distorted surface  527 ′ where there is no appreciable S/N level derived from the variable indicia  410 ′ such that the information inherent in the variable indicia  410 ′ cannot be discerned and again the ticket becomes irrevocably damaged. 
     The same principle applies when the homogenized embodiments of the ticket  400  of  FIG. 4A  are subjected to a fluorescence attack  600  of  FIG. 6A —i.e., no appreciable S/N ratio of the ticket variable indicia  410  relative to the ticket background can be discerned. For example,  FIG. 6A  depicts the exemplary ticket under a fluorescence attack similar to  FIG. 3B . However, in  FIG. 6A  an excitation light source  601  attempts to project sufficient photons of the correct excitation wavelength  602  to induce fluorescence photon emissions  606  from the variable indicia that after attenuation from passing through the upper security ink stack ( 406  thru  409 ) can be bandpass filtered  604  with sufficient intensity  607  to be detected by a timed camera exposure  605 . However, in  FIG. 6A  the fluorescence photo emissions from the overprint  409  and/or the display  411  areas completely overwhelm any fluorescence induced photons from the variable indicia, resulting in a bandpass limited  604  time exposure image  605  that does not carry a sufficient S/N ratio of the variable indicia relative to the overprint area  409  and/or the display area  411  background noise to discern the variable indicia. Again, the common shared application of similar materials (ink) of the variable indicia with the display area  411  and the overprint area  409  results in a homogenous ticket  600  where the variable indicia cannot be picked-out due to insufficient S/N ratio. 
     When the same embodiment of the ticket  600 ′ of  FIG. 6B  is subjected to a fluorescence attack  620  and  621  from the back side a similar homogeneous countermeasure result occurs  624 . In this embodiment, the legal text  426  overlapping the variable indicia on the ticket&#39;s back is composed of the same chemical composition (ink) as the variable indicia  410 ′ resulting in any emitted photons  625  from the variable indicia  410 ′ having the same fluorescence wavelength emissions  622  as the legal text  426  such that there is no appreciable S/N level derived from the variable indicia  410 ′ that can be discerned after bandpass filtering  623  due to the fluorescence emissions  626  of the legal text  426  completely overwhelming the emissions  625  from the variable indicia  410 ′. 
     With the homogenized embodiment  600 ″ of  FIG. 6C  the S/N ratio becomes even lower due to the added translucent display layer  428  comprised of the same chemical composition (ink) as the variable indicia  410 ′ being printed in addition to the legal text  426 ′ that are subjected to a fluorescence attack  620 ′ and  621 ′. Thus, again the fluorescence emissions  622 ′ of the legal text  426 ′ and the added translucent display layer  428  result in an even more overwhelmed captured image  624 ′ from the bandpass limited  623 ′ fluorescence photons  626 ′ again resulting in no appreciable S/N level derived from the variable indicia  410 ′ such that the information inherent in the variable indicia  410 ′ cannot be discerned. 
     In various embodiments of the present disclosure, the homogenous integration of ink used in the variable indicia with the other printed portions of the document is the identical ink, so that the S/N ratio of the ink used for the variable indicia will be the same as the background ink noise of the other printed portions. Such inks may be any of a dye based ink, a pigment based ink, a toner based ink, or inks having other bases. Also in accordance with the present disclosure, the inks of the variable indicia and the other portions may be applied using the same printing technique, such as ink jet printing, thermal transfer or xerography, for instance, for the same reason. This results in the homogeneous inks of the variable indicia having no appreciable S/N ratio relative to the background ink noise of the document&#39;s at least one other printed portion, such that the variable indicia cannot be discerned so long as the SOC remains intact. 
     The disclosure also includes methods and systems for making a secure document as described above. In various embodiments—the method broadly comprises printing the variable indicia comprising ink having a S/N ratio relative to the background ink noise of the document&#39;s at least one other printed portion, such that the variable indicia are unreadable with reference to the at least one other printed portion when the scratch-off-coating remains intact. 
     Various types of printing presses and combinations of printing presses can be used to make the disclosed secure document in accordance with the present disclosure. For example,  FIG. 7A  illustrates one embodiment of a printing press  700  capable of producing tickets with homogenous integration of the variable indicia, the display area, the overprint area, and/or the ticket back printing area. As shown in the embodiment of  FIG. 7A , paper is fed into the press on a spool  701  to a seven-color digital imaging unit  702 . The seven-color unit  702  images a Lower Blocking Black (LBB) ink film layer and two white high contrast overprint ink film layers in the shape of the variable indicia scratch-off area such as with an Ultraviolet (UV) based curing system. After the lower security LBB ink film layer and the white high contrast ink film layers are applied, a four-color process digital image  702  is applied to image both the ticket variable indicia and display area. Thus, the printed ticket will have a homogenized variable indicia and display area. After printing the front variable indicia and display area the substrate is flipped and the ticket back is imaged as a four-color process by a unit  703  with application and materials identical to the process colors applied by unit  702  resulting in a homogenized ticket backing. After the ticket back is printed, the substrate is again flipped and a release coat layer is flexographic printed at a station  704  over at least the variable indicia to provide protection for the variable indicia as well as to ensure that any subsequent ink film layers deposited on the release coat will scratch-off. In various embodiments, the release coat layer is also direct energy cured with either UV or an electron beam. After the release coat layer is applied, a second seven-color unit  705  images an Upper Blocking Black (UBB) ink film layer and two white high contrast overprint ink film layers in the shape of the variable indicia scratch-off area preferably with an UV curing system. After the upper security UBB ink film layer and white high contrast ink film layers are applied, a four-color process digital image is applied to image the overprint area(s) with the same materials (inks) as the process colors applied by unit  702  resulting in a homogenized ticket overprint. Once the upper security layers and overprint layers have been imaged, periodic perforations are stamped into the substrate by a unit  706  to enable strips of tickets to be packaged and torn off individually at the time of sale. The resulting fully imaged and perforated substrate is then collected via a take-up reel or fan-folder. The embodiment of  FIG. 7A  has the advantage of rapid setups between press runs with the flexographic plate of the release coat at the station  704  being the only station that requires manual intervention with a possible disadvantage of low press speeds. 
     Another exemplary preferred press configuration capable of producing the ticket or document embodiments of  FIGS. 4A, 4B, and 4C  is illustrated  725  in  FIG. 7B . The  FIG. 7B  press configuration  725  featuring three sets of process color digital imagers, one for the front display and game play variable indicia  728  (shown magnified as callout  734 ), a second for the back of the ticket  729  (shown magnified as callout  736 ), and a third process color digital imager  731  (shown magnified as callout  726 ) for the Overprint or “OP.” 
     As shown in  FIG. 7B , the press configuration embodiment  725  illustrates a modified hybrid flexographic and digital imager printing press used to produce variable indicia SOC secured tickets or documents that are typical in the industry. The typical industry press  725  unravels its paper web substrate from a roll  726  and flexographically prints  727  lower security layers in the scratch-off area as well as optionally primer. At this point, the press web enters a secured imager room where the front game play variable indicia are applied by imager  728 . However, as disclosed herein with magnified view  734 , the front game play variable indicia and display are digitally imaged as process colors with the separate Cyan  737 , Magenta  738 , Yellow  739 , and Black  740  print heads synchronized together to produce a common process color (CMYK) display and game play variable indicia image on the front of the ticket. Imager  729  (shown magnified in  735 ) is utilized to digitally image CMYK process colors ( 741 ,  742 ,  743 , and  744 —respectively) on the ticket back. Next, a subsequent series of flexographic print stations  730  printing the upper security layers. At this point, a third digital imager  731  (shown magnified in  736 ) images a CMYK ( 745 ,  746 ,  747 , and  748 —respectively) OP on top of the SOC with fixed printing plate station  732  optionally providing a clear glossy varnish on top of the OP and/or display for added esthetics. Finally, the web would be rewound into a roll  733  for storage and ultimate processing by a separate packaging line. 
     The process color imagers simply represent one embodiment of this disclosure with other embodiments possible and more desirable under some circumstances. For example, high-resolution monochromatic digital imagers could be employed for the front and legal text back of the ticket instead of process color imagers, thereby resulting in a cost savings. 
     There are other variations of the disclosed embodiments that would be apparent in view of the present disclosure and would be within the parameters of the appended claims.