How do you know that it’s impossible to prove that this user downloaded the file in the torrent network, but you can only copy the list of peers by connecting to the distribution, then a request is sent to your client about what% of your download, but at this stage you can break the connection that we and offer.
You probably remember the program that did it -
PeerGuardian , but it does not work under Win Vista \ 7 and we also have other equally good OSes.
Recently, the old PeerGuardian survived the upgrade to peerblock, now it does not install drivers into the system and looks like this.

There are also blockers for MacOs
For MacOs here is the standard PeerGuardian.
')
But in order to use these programs, you also need block lists, the site
www.iblocklist.com was recently launched, where they collected about

On the site, you can select the sheet you like and enable filtering.

Then if you suddenly stumble upon an unwanted feast, then the packet is blocked,
be it UDP or TCP, which is useful with the introduction of uTP in uTorrent
On the links below you can download the blockers under
WindowsMacosUnfortunately, under Linux I did not find a solution, but by how many block lists there are, I think they will be where to tie them.
I'd add that the download speed does not slow when using a blocker.
Here are screenshots of the program in various poses
Here you can immediately choose which sheets to subscribe.

View history

Check for updates manually, by itself updates are automatically checked.

Well, 2 settings pages


Consumes only 3 megabytes

This is what I? And besides that extra protection does not hurt :)