ACR fingerprinting analyzes features of the video and or audio frames to create fingerprints for each piece of content. These fingerprints are unique to each sequence and are highly robust against broadcast distortions such as re-encoding, aspect ratio, frame rate, up/down conversion and pitch correction. Fingerprints are stored in a reference database and unidentified content can be found by comparing to the stored version. Zeitera's fingerprinting techniques can accurately identify a very small portion of unidentified content from anywhere in the unknown program.