Printed document control with verified unique watermarks
AssigneeSonicWALL, Inc.
InventorSamuel James Liddicott
Life of this patent
Estimating the term…
Abstract
Systems and methods are directed towards generating a verified unique watermark. More specifically, the systems and methods are directed towards generating a watermark that is as long as possible without any repetition. Such watermarks are possible by selecting characteristics of the watermark and methods for producing the watermarks (e.g., dandy rollers). By producing longer unique watermarks, users would be capable of generating longer rolls of paper whereby more sheets can be produced that each possesses a unique watermark. With the unique watermark, users can identify what information is printed on each sheet as well as authenticate the contents of each individual sheet.
Claims16
A method for generating a verified unique watermark, the method comprising:
- selecting two or more visible marks to be embedded into paper, wherein each of the selected marks are assigned to a unique roller of a plurality of rollers, each roller having a circumference measurement having a difference from a respective circumference of each other roller, and wherein the difference in circumference is an irrational number;
- aligning the unique rollers to which the selected marks have been assigned;
- generating a combined mark from the selected two or more visible marks assigned to the aligned unique rollers, wherein the generated combined mark is produced by the unique rollers patterning the selected marks onto the paper and reflects the difference in circumference being the irrational number;
- and
- storing information associated with the generated combined mark and the roll of paper onto which the generated combined mark was patterned.
Dependencies are inferred from the claim text.