The most reliable way to get accurate subtitles is through official streamers. You can often find Panchatanthiram , though subtitle availability can vary by region. Official YouTube Channels: The producer’s channel, Thenappan P - Raajalakshmi Films
Finding a "useful paper" for a movie subtitle download is a bit of a unique request! If you are looking for the actual for the 2002 Tamil comedy classic Panchathantiram panchathanthiram english subtitles download srt link