International Business Machines Corporation
SECURE EMBEDDED WATERMARKS

Abstract:

An article comprises a superficial watermark located on a first surface. The article also comprises an embedded watermark that is embedded within the article. The embedded watermark may be viewed by an X-ray camera. A method comprises applying a metal-containing mixture to an inner layer of an article, resulting in an embedded watermark within the article. The method also comprises analyzing the properties of metal particles within the mixture. The method also comprises recording the first property.