Optical Watermarking (IMAGE) Optica Caption A new optical watermarking system uses single-shot ptychography encoding to create the watermark (Part 1) that is then embedded into a host image (Part 2). Credit Yishi Shi, University of Chinese Academy of Sciences Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.