A bearer document processing system includes preparation, verification, redeeming and depositing of the document. An encrypted symbol is imprinted on the document using ink that is not visible in invisible light. The symbol includes information used to authenticate the document and to identify the bearer...http://www.google.ca/patents/US7016524?utm_source=gb-gplus-sharePatent US7016524 - System for authenticating and processing of checks and other bearer documents
