Abstract: Systems and methods to perform reverse pattern recognition matching are provided in which identical and similar media files and related information may be identified using the media file itself as a starting point for a query of stored information. Unique identifiers may be created from an initiating media file using cryptographic and perceptual hash functions. The resulting hashes may be compared to data of other media files using hamming and other comparative methods. In an embodiment, the invention may be used to identify copyright ownership of non-attributed creative works. Searches for similar or identical media files may be performed using based on a media file, which may not be controlled by a rights holder of the media file.