ALEXANDRIA, Va., July 28 -- United States Patent no. 12,694,201, issued on July 28, was assigned to EchoMark Inc. (Kirkland, Wash.).

"Document marking using alternative terms for document source detection" was invented by Sanjay Krishnan (Hinsdale, Ill.), David Wong (Los Gatos, Calif.), Chad Voss (Seattle), Troy Batterberry (Kirkland, Wash.), Clayton Huthwaite (Chesterfield, Va.), Colin Saunders (San Francisco), Stephen Bianamara (Seattle) and Parker Beck (Kenmore, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Unique copies of an original document can be generated and provided to individual recipients. The unique copies can be used to identify the source of a document leak. The unique copies are gener...