the copywrite stuff would goto the vpn if you got flagged, its nothing to do with the isp.
thats the whole idea of a vpn...
and its not illegal to use a vpn, they are a legit service. but there are other ways around receiving copywrite infringements, like using invite only torrent sites. only the public stuff you get your name on the list.
edit: every service generally runs the 3 strikes rule also, so you KNOW if what your doing is being flagged. 3 strikes you get booted (both vpn and isp, find a new company, and find a new way to get your media). its not hard.