"If a parent sees pop-up ads and viruses on her computer, she can be sued for copyright infringement by the RIAA.

At least that's what the RIAA is arguing in a recent court filing in the Capitol v. Foster case, in which a federal judge made the RIAA cough up attorney's fees to a mother, Debra Foster, who had been sued because her daughter was file sharing. The RIAA lawyers had dawdled in dismissing their complaint against Foster, even after her child admitted to being the file-sharer in the house (the RIAA went ahead and got a default judgment against the child)."

http://www.eff.org/deeplinks/archives/005135.php