A method (and apparatus) for guaranteeing authenticity of an object, includes providing a sample of material obtainable only by at least one of chemical and physical processes such that the sample is random and not reproducible, associating a number reproducibly to the sample by using a specific reader,...http://www.google.es/patents/US20020095383?utm_source=gb-gplus-sharePatente US20020095383 - Method and apparatus for secure sale of electronic tickets
Method and apparatus for secure sale of electronic tickets
