1. A method for providing a printed identification of the source of a magnetic ink character recognition (MICR) printed document printed by a printer using a character-cell set, said identification being printed directly on said document comprising: for each source of a printed document, providing a unique character-cell set having a set of character cells for printing onto a document wherein at least one of said character cells has binary code, defined by a series of long and short parallel lines arranged in a row, included therein which uniquely identifies the said character-cell set used by a MICR printer in printing the document; downloading said character-cell set to a printer; selecting character cells from said character-cell set for printing onto a document, said selected character cells including at least one character cell having the binary code; and printing said selected character cells onto a document, such that the binary code is also automatically printed.