Here is a story from Colorado:
<http://www.thedenverchannel.com/news/22745694/detail.html>
A person who borrowed a DVD from a public library and never returned
it was arrested on a theft warrant which had been issued by the city.
There was obviously no theft when the DVD was first borrowed, so we
that something can become a crime over time even without specific
action. Similarly, copying and distributing GPL-covered works without
honoring the conditions of the license is copyright infringement,
regardless of the circumstances under which the copier first obtained
the work.
(Of course the arrest caused a contretemps and the charges were
subsequently dropped, but that's not relevant.)