A system for identifying a work represented by digital data. This system detects events in data of the content of an unknown work and measures a metric between the events. The system then compares the detected events and metrics from an unknown work with the events and metrics of a known work. If the...http://www.google.de/patents/US20090031326?utm_source=gb-gplus-sharePatent US20090031326 - SYSTEM FOR IDENTIFYING CONTENT OF DIGITAL DATA
