Actually, casual copyright infringement has been dealt with
more and more lately; one of the reason you see precise instructions in
Kinko's Copier locations, and the reason they won't copy a full
manuscript unless you can prove you own it, is because they got hit
bigtime over the issue. It is, as you say, an area which has been dealt
with only casually, but which I suspect is going to get more attention,
particularly as the nets come more fully under the scrutiny of Suits.
(I think I just made an inadvertent pun...)