In the mid-1980s Xerox pioneered an encoding mechanism for a unique number represented by tiny dots spread over the entire print area. Xerox developed the machine identification code "to assuage fears that their color copiers could be used to counterfeit bills"[4] and received U.S. Patent No5515451 describing the use of the yellow dots to identify the source of a copied or printed document

5:5

Who knew some .1mm dots would set this thing in motion