A system method for providing an authentication code across a network for use in authentication of documents, such as printed lottery tickets. The system includes document-printing terminals that create a first key and a second key, with the first key used to generate an authentication code for printing...http://www.google.es/patents/US7788482?utm_source=gb-gplus-sharePatente US7788482 - System and method for securing on-line documents using authentication codes
System and method for securing on-line documents using authentication codes
