Is there an insivible code on printed documents that I can't see or am I paranoid?

Answer 1

there is not an insivible code on a printed document

A Different Perspective:

If you're not paranoid then you just don't have all the facts, man! Invisible codes are everywhere and if you can't see them that's only because they are invisible. What better way to keep secret codes so secret than making them invisible and even better yet how about invisible codes on invisible documents? How about this, invisible conspirators who invisibly write invisible codes on invisible documents? Paranoid? Just because your friends never say it to your face you got to know man, that behind you're back when you're not looking or listening they get all invisible and talk about how paranoid you are. Paranoia is the only sane way to be in a world where the man, invisible as ever, dictates the rules on invisible documents written in invisible codes.

I don't think there are invisible codes. But there are in fact VISIBLE codes for documents that are printed. I believe every printer is required by the US Government to print a sequence of dots on a paper in some fashion. These dots can later be used to determine the original printer that printed the document.

A reference is here: http://www.instructables.com/id/Yellow_Dots_of_Mystery_Is_Your_Printer_Spying_on_/

Answer 2

You may be referring to hidden watermarks or tracking codes that certain printers embed into documents for security purposes. While this technology exists, it's not typically used on everyday printouts. If you're concerned, you can consult with a security expert or use a device that can detect such markings.