At least, that is rumoured on scotusblog.com [1].
The Supreme Court ruled unanimously that developers of software violate federal copyright law when they provide computer users with the means to share music and movie files downloaded from the internet.
Slyck.com has some more details [2]. But finally only that opinion [3] will count.
[1] http://www.scotusblog.com/movabletype/archives/2005/06/grokster_stream.html
[2] http://www.slyck.com/news.php?story=838
[3] http://www.supremecourtus.gov/opinions/04slipopinion.html
