See what kind of announce URL is included in the .torrent. Is it just

    udp://tracker.publicbt.com:80/announce

or does it include information that could be used to identify you, like

    http://tracker.bittorrentbundle.net:3000/3pr4s5y7l9nh0mdwcqyh3a9k6n7d0kta/announce

Other than tracker identifying you, seeding and downloading works the same in both cases.

Just anyone else is wondering, it's:

    http://tracker.bundles.bittorrent.com/tracker/{a whole lot of hex}