Young Kim_JU13400.jpg (IMAGE) Purdue University Caption People can use a smartphone app to activate a new cyberphysical watermark to detect whether the medication they are taking is real or fake. Purdue biomedical engineers have developed the cyberphysical watermark as a way to reduce fake medications. Credit Purdue University photo/John Underwood Usage Restrictions None. License Original 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.