“The music industry’s methods of tracking down suspected music pirates have been revealed for the first time. Using digital fingerprints, or ‘hashes’, investigators say they can tell if an MP3 file was downloaded from an unauthorised service. The industry also tracks ‘metadata’ tags, which provide hidden clues about how files were created.” The methods of detection were revealed in the proceedings of an industry lawsuit against a file-trader known by her screenname, ‘Nycfashiongirl,’ who is accused of offering over 900 copyrighted and illegally obtained songs for free download.