ng auxiliary data within a source signalUS5822436 *25 Abr 199613 Oct 1998Digimarc CorporationPhotographic products and methods employing embedded informationUS5825402 *26 Mar 199320 Oct 1998Symbol Technologies, Inc.Method and appratus for reading and writing indicia such as bar codes using a scanned laser beamUS5832119 *25 Sep 19953 Nov 1998Digimarc CorporationMethods for controlling systems using