The Pirate Bay is one of the most popular public torrent trackers, and today four men behind the website appeared in court in Stockholm, Sweden under charges that they have assisted in copyright infringement. The prosecutions case is that the four men have profited from copyright infringement through one of the largest file sharing networks on the internet. The defendants argue that they have hosted no shared files and therefore aren't responsible for any infringement. If convicted, the men could face 2 years in prison along with a fine of 1.2 million kronor (about $140,000). The trial has attracted so much attention in Sweden that tickets to get into the courtroom were reportedly being sold for 500 kronor ($60) on the black market. Among the plaintiffs, who are calling for damages of 120m kronor (around $14m) are Universal, EMI, Song BMG, 20th Century Fox, MGM, Warner Bros and Columbia Pictures Industries.