The Transmission torrent client has an option to set a Blocklist, which helps protect you from getting caught and having the DMCA send a letter/email.
It's as simple as downloading and installing the latest client:
After installing, navigate through the menu: Edit > Preferences > Privacy:
- Check enable blocklist
- Paste in: http://john.bitsurge.net/public/biglist.p2p.gz
- Check Enable automatic updates
- Click Update