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2. Void pantograph - Wikipedia

   en.wikipedia.org/wiki/Void_pantograph

   In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message. [1]

3. Optical character recognition - Wikipedia

   en.wikipedia.org/wiki/Optical_character_recognition

   Video of the process of scanning and real-time optical character recognition (OCR) with a portable scanner. Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text into machine-encoded text, whether from a scanned document, a photo of a document, a scene photo (for example the text on signs and ...

4. Evince - Wikipedia

   en.wikipedia.org/wiki/Evince

   Evince allows the selection of text in PDF files and allows users to highlight and copy text from documents made from scanned images, if the PDF includes OCR data. Evince used to obey the DRM restrictions of PDF files, which may prevent copying, printing, or converting some PDF files, however this has been made optional, and turned off by ...

5. Google Books - Wikipedia

   en.wikipedia.org/wiki/Google_Books

   Google would also provide a digital copy of all works scanned to be incorporated into the university's own library system. [89] September 2007: Google added a feature that allows users to share snippets of books that are in the public domain. The snippets may appear exactly as they do in the scan of the book, or as plain text. [90]

6. Image scanner - Wikipedia

   en.wikipedia.org/wiki/Image_scanner

   Alexander Murray and Richard Morse invented and patented the first analog color scanner at Eastman Kodak in 1937. Intended for color separation at printing presses, their machine was an analog drum scanner that imaged a color transparency mounted in the drum, with a light source placed underneath the film, and three photocells with red, green, and blue color filters reading each spot on the ...

7. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   A PDF creator and virtual PDF printer for Microsoft Windows PDF-XChange: Proprietary: Yes: PDF Tools allows creation of PDFs from many types of source input (images, scans, etc.). The PDF-XChange print driver allows printing directly to a PDF. A "lite" version of the print driver is free for non-commercial (home and academic) use. PrimoPDF ...