Method and apparatus for inhibiting the copying of checks and negotiable documentsР”РЋ. Negotiable document having enhanced security for deterring generation of copies of the negotiable document Printed document and method of determining the print quality of a printed document Printing system, process, and product with a variable pantograph Security document manufacturing method and apparatus using halftone dots that contain microscopic images Printing system, process, and product with microprinting Tools to embed tampering indicator into digital visual worksР”Вocument Containing Scanning Survivable Security Features Systems for spectral multiplexing of a source image and a background image to provide a composite image, for rendering the composite image, and for spectral demultiplexing of the composite images Techniques for Detecting, Analyzing, and Using Visible Authentication Patterns METHOD AND DEVICE FOR MAKING DOCUMENTS SECURE Image forming apparatus and method for controlling image forming apparatusР”В¬opy-forgery-inhibited pattern or stamp image combined with image data based on user actions Techniques for detecting, analyzing, and using visible authentication patterns Image forming apparatus and image processing apparatus Method and system for transmitting data from a first data processing device to a second data processing deviceР”В¬opy-forgery-inhibited pattern image generation method and image processing apparatus Pantograph methods, apparatus and systems based on UCR/GCR Single-color screen patterns for copy protectionР”Р„uthenticable anti-copy document and method to produce an authenticable anti-copy document with a combined void pantograph and faux watermark security features

Void pantographs and methods for generating the same using at least one test void pantograph

What is a void pantograph