|“||analyzes the actual content of an audio file, as opposed to a written description of what is contained within it (e.g., 'metadata'). This means that the filtering tool 'listens' to the sound recording, and creates a twenty-second 'fingerprint' that can then be compared against any other file that an end-user is attempting to upload or download. If the suspected file has that precise sequence (or spectrum) of sounds, the uploading or downloading of the song will be blocked.||”|
- ↑ Metro-Goldwyn-Mayer Studios, Inc. v. Grokster, Ltd., 518 F.Supp.2d 1197, 1205 (C.D. Cal. 2007) (full-text) (citations omitted).