Printing method and copy-evident secure document

A copy-evident document which when copied results in a copy with a readily visually perceptible warning indicia that the copy is not an original document comprised of:

• a document substrate having a surface;
• a plurality of composite designs on said surface, each composite design comprised of an image warning design bordered by a background design,
• said image warning design and said background design are each comprised of generally parallel printed lines of approximately equal width and depth on said surface with the lines of said image warning design being offset at an angle to the lines of said background design,
• said lines of at least one of such composite designs being aligned 90.degree. out of phase with respect to the corresponding lines of another composite design,
• said lines of said designs further being sufficiently fine in pitch and width so as to make the image warning designs difficult to distinguish from the background designs on casual inspection of the document with the naked eye while at the same time exploiting a photocopier's or facsimile machine's inability to accurately resolve the composite designs, thereby making at least one image warning design appear readily apparent upon casual inspection of any copy of the document.

A copy-evident document which when copied results in a copy with a readily visually perceptible warning indicia that the copy is not an original document comprised of:

• a document substrate having a surface;
• a plurality of composite designs on said surface,
• each composite design comprised of an image warning design bordered by a background design;
• said image warning design and said background design are each comprised of generally parallel printed lines of approximately equal width and depth on said surface with the lines of said image warning design being offset at an angle to the lines of said background design,
• the lines of at least one composite design being aligned at an angle with respect to the corresponding lines of another composite design,
• said lines of said designs being sufficiently fine in pitch and width so as to make the image warning designs difficult to distinguish from the background designs on casual inspection of the document with the naked eye while at the same time exploiting a photocopier's or facsimile machine's inability to accurately resolve the composite design, thereby making at least one image warning design appear readily apparent upon casual inspection of any copy of the document.

A master for producing copy-evident documents which when copied results in a copy with a readily visually perceptible warning indicia that the copy is not an original document comprising:

• a surface;
• at least one composite design on said surface comprised of an image warning design bordered by a background design,
• said image warning design and said background design are each comprised of generally parallel lines of approximately equal width and depth on said surface with the lines of said image warning design being offset at an angle to the lines of said background design,
• said lines of said designs being sufficiently fine in pitch and width so as to make the resulting image warning design difficult to distinguish from the resulting background design on casual inspection of the resulting document with the naked eye while at the same time exploiting a photocopier's or facsimile machine's inability to accurately resolve the resulting composite design, thereby making the image warning design appear readily apparent upon casual inspection of any copy of the resulting document.

A master for producing copy-evident documents which when copied result in a copy with a readily visually perceptible warning indicia that the copy is not an original document comprising:

• a surface;
• a plurality of composite designs on said surface, each composite design comprised of an image warning design bordered by a background design,
• said image warning design and said background design are each comprised of generally parallel lines of approximately equal width and depth on said surface with the lines of said image warning design being offset at an angle to the lines of said background design,
• said lines of at least one of such composite designs being aligned 90.degree. out of phase with respect to the corresponding lines of another composite design,
• said lines of said designs further being sufficiently fine in pitch and width so as to make the resulting image warning designs difficult to distinguish from the resulting background designs on casual inspection of the resulting document with the naked eye while at the same time exploiting a photocopier's or facsimile machine's inability to accurately resolve the resulting composite design, thereby making at least one image warning design appear readily apparent upon casual inspection of any copy of the resulting document.

A master for producing copy-evident documents which when copied result in a copy with a readily visually perceptible warning indicia that the copy is not an original document comprising:

• a surface;
• a plurality of composite designs on said surface, each composite design comprised of an image warning design bordered by a background design;
• said image warning design and said background design are each comprised of generally parallel lines of approximately equal width and depth on said surface with the lines of said image warning design being offset at an angle to the lines of said background design,
• the lines of at least one composite design being aligned at an angle with respect to the corresponding lines of another composite design,
• said lines of said designs being sufficiently fine in pitch and width so as to make the resulting image warning designs difficult to distinguish from the resulting background designs on casual inspection of the resulting document with the naked eye while at the same time exploiting a photocopier's or facsimile machine's inability to accurately resolve the resulting composite design, thereby making at least one image warning design appear readily apparent upon casual inspection of any copy of the resulting document.