I think this is more of a "how to download illegal content and reduce the risk of getting caught" than "how to do it legally..."

Anyways.. As probably a good 50% of people I know use the internet for other than legal reasons, unless you are filling up a hard drive on a weekly basis or selling burned DVD-Rs at car boot sales, the chances of them wanting to bend you over their knees is quite slim anyway.

99% of the time, they issue a cease email through the ISP first so if they do come knocking on the door its your fault