Tribler also means you're an exit node?
   [1]http://forum.tribler.org/viewtopic.php?f=2&t=6906
   To quote:

     I received two copyright notices from Comcast while letting Tribler
     idle. This is the first and only time I have received these notices.
     1) I have not downloaded anything at all. Nothing. The test file
     popped up to idle. Otherwise, not a movie of any variety, not even a
     linux ISO to test. I had subscribed to a few channels.
     2) These only came up after I installed Tribler and have left it
     idling.
     3) I was not seeding anything.
     Infringing Work: The Newsroom
     Filename: The.Newsroom.2012.S03E06.HDTV.x264-KILLERS[ettv]
     Infringement Date: 2014-12-19
     Infringement Type: BitTorrent
     Infringement Method: BitTorrent
     IP Address:
     Reporting Party: [2]copyright@ip-echelon.com
     Infringing Work: Teachers
     Filename: Teachers
     Infringement Date: 2014-12-19
     Infringement Type: Movie
     Infringement Method: P2P
     IP Address:
     Reporting Party: [3]support@cegtek.com

References

   1. http://forum.tribler.org/viewtopic.php?f=2&t=6906
   2. mailto:copyright@ip-echelon.com
   3. mailto:support@cegtek.com