Printer driver separately applying watermark and information

摘要

The present invention provides a printer responsive to commands from printer driver software. The printer driver software is characterized by being responsive to two types of input data. One of the types includes text data, and the other of the types includes watermark data. The two types of data are separately applied to printer driver software, rather than integrated together prior to application to the printer driver software.

主权项

1. A method comprising:
receiving, at a processor, text data; receiving plural-bit digital watermark data, wherein the text data and the plural-bit digital watermark data are separate; generating, using the processor, printer commands for a printer based on the text data and the plural-bit digital watermark data, wherein the printer commands configure the printer to control printing of text associated with the text data and a watermark associated with the plural-bit digital watermark data such that the watermark is imperceptible to a human viewer, wherein the printer commands adjust the print density to a first density based upon printing the text, wherein the first density comprises a first density of ink droplets, wherein the printer commands adjust the print density to a second finer density based upon printing the watermark, wherein the second print density comprises a second density of ink droplets that is finer than the first density of ink droplets, and wherein the watermark comprises a component that is machine-detectable in a frequency domain.