A system for decoding machine-readable graphical codes is provided. The system includes a graphical code reading device configured to read a graphical code and generate reference encoded source data. The reference encoded source data includes a first reference identifier and a second portion. The system...http://www.google.com/patents/US6957769?utm_source=gb-gplus-sharePatent US6957769 - System and method for encoding and decoding data and references to data in machine-readable graphical codes
