A system, method, and apparatus for authenticating microparticle marks or marks including other three-dimensional objects. The authentication utilizes two or more sets of information captured or acquired for the mark in response to illumination of the mark by electromagnetic energy such as in the visible...http://www.google.es/patents/US7831042?utm_source=gb-gplus-sharePatente US7831042 - Three-dimensional authentication of microparticle mark
Three-dimensional authentication of microparticle mark
