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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. Copy detection pattern - Wikipedia

   en.wikipedia.org/wiki/Copy_detection_pattern

   A copy detection pattern (CDP) [1] or graphical code [2] [3] is a small random or pseudo-random digital image which is printed on documents, labels or products for counterfeit detection. Authentication is made by scanning the printed CDP using an image scanner or mobile phone camera. [4]

4. Photostat machine - Wikipedia

   en.wikipedia.org/wiki/Photostat_machine

   A typical typewritten document would appear on the photostat print with a black background and white letters. Thanks to the prism, the text would remain legible. Producing photostats took about two minutes in total. The result could, in turn, be photostated again to make any number of positive prints.

5. List of duplicating processes - Wikipedia

   en.wikipedia.org/wiki/List_of_duplicating_processes

   Trypograph (also file plate process) Cyclostyle, Neostyle; Stencil-based machines Mimeograph (also Roneo, Gestetner) Digital Duplicators (also called CopyPrinters, e.g., Riso and Gestetner) Typewriter-based copying methods Carbon paper; Blueprint typewriter ribbon; Carbonless copy paper; Photographic processes:

6. Duplicating machines - Wikipedia

   en.wikipedia.org/wiki/Duplicating_machines

   Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers, and photocopiers, but for many years they were the primary means of reproducing documents for limited-run distribution.

7. Attach or insert files, images, GIFs and emojis in New AOL Mail

   help.aol.com/articles/attach-files-or-insert...

   - Your computer's file manager will open. Find and select the file or image you'd like to attach. Click Open. The file or image will be attached below the body of the email. If you'd like to insert an image directly into the body of an email, check out the steps in the "Insert images into an email" section of this article.