Patent ID: 9630443
Date: 2017-04-25
CPC Classifications: B29C,B42D,G06F,G06K,G06Q,G06T,G07C,G07D,G07F,G11B,H04N

Claim:
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.