The headquarters of The Pirate Bay, a web site that enables users to find and download pirated music and movies, was raided by Swedish police this week, setting up a legal confrontation over the issue of whether such sites can be held responsible for the actions of their users. Courts in several other countries, including the U.S., have held that sites clearly intended to facilitate illegal activity are not protected by law. The fight is likely to be more complicated in Sweden, however – the country is notorious for tolerating file-sharing, and has no specific law prohibiting it.