Earlier this week a Danish court decided that an ISPs have to block access to The Pirate Bay. In response to the judgment, three ISPs have already announced that they will take the case to the Supreme Court. In addition, The Pirate Bay itself now says it will sue the anti-piracy outfit IFPI if the ISPs fail to overturn the ruling.

The decision to block The Pirate Bay has once again ignited a debate on Internet filtering, the responsibilities of Internet providers and the legal status of BitTorrent sites. The IFPI – the RIAA’s global partner – has chalked up a small victory this week, but the fight is far from over.

Peter Sunde, co-founder of The Pirate Bay told TorrentFreak that they are seriously considering suing the IFPI for unfair competition. “They have had a monopoly on distribution and we’re breaking that monopoly, and in turn they sue people that allow access to our distribution method,” he said.

Meanwhile, all other BitTorrent sites are still accessible in Denmark, and thus far the IFPI hasn’t announced it will go after any of them. This, together with the fact that there are several tricks to get around the block, make their legal strategy look like a personal vendetta against The Pirate Bay instead of an effective measure against piracy.

Before The Pirate Bay takes action against the IFPI, they will first await the outcome of the Supreme Court appeal that the three ISPs – DC, Telia and Telenor – announced earlier this week. If the appeal is unsuccessful, and when they find the perfect lawyer to represent them, The Pirate Bay will sue IFPI.

The IFPI seems to be looking forward to yet another confrontation. “Peter Sunde is welcome to sue us,” Jesper Bay, the head of the Danish IFPI told Comon.dk in a response to the news. Ironically, one of the websites explaining how to get around the Danish blockade carries Jesper Bay’s name.

For now, the Pirate Bay team has another court case to focus on. In two weeks their trial in Sweden kicks off, where the IFPI will also be one of their opponents. To be continued.

Update: Initially we reported that all Danish ISPs have to block the Pirate Bay. This is not the case. The latest court decision is a preliminary injunction against DMT. This means that it is only binding against ISPs owned by DMT (thanks Ole).