Systems and methods are provided for validating the authenticity of a signature on a document by providing a document from an account, the document including an actual signature and a machine-readable identifier, wherein the machine-readable identifier contains a string of data representing the integral...http://www.google.com.hk/patents/US7430310?utm_source=gb-gplus-share專利 US7430310 - System and method for check fraud detection using signature validation
