If there is a legal copy it will most likely be on their website.
there is no Free copy online, even viewing it on youtube is illegal. Thats why so many youtube videos have been taken down.
However, if you are in a country/area that believes that distrobuting video/audio/progams is your right. since youve paid for it in taxe when you bought your Hard drive computer, and blank Cds and DVDs then you can download torrents without fear.
Bittorrent is not illegal, neither is the Gnutella network, but if its illegal to download in your network, then its illegal no matter what you download it with even just through Internet Explorer.
if you want free, chances are your gonna have to break some rules.