The Pirate Bay (TPB), one of the world's biggest torrent tracker sites, found itself embroiled in controversy last month, when a link to a torrent containing photographs of a grisly child murder in Sweden appeared on the site.

A torrent is a small file that contains information about another file, such as a movie, distributed using the BitTorrent peer-to-peer protocol. The torrent itself doesn't contain the movie, but acts as a marker of sorts, pointing computers to the actual file.

The torrent of the photographs, which were released by a Swedish court presiding over the case, was not posted online by TPB or its founders, but the site nevertheless found itself at the center of a discussion on the limits of free speech on the Internet, and to what extent Web sites should be held responsible for content posted by users.

The controversy was different from that normally faced by TPB, which has made enemies of the music and movie industries, as well as the U.S. government, over allegations its activities violate copyright law -- charges the site denies, citing differences between U.S. and Swedish law.

You can read the entire article at PC World.