Subdownloader is a GPL licensed opensource software for automatic download and upload subtitles for videofiles (DIVX, MPEG, AVI,etc) from www.OpenSubtitles.org (OSDB) and some others (ISDB). SubDownloader uses special hash function for finding correct subtitles.How it works:?? Subdownloader applies to the VideoFile a Moviehash function getting an unique 64 bit string. ?? It requests this string to a online databases which contains the subtitles. See the XmlRpc Api. ?? It downloads the choosen subtitle(s) from the server.Here are some key features of "SubDownloader":