The Pirate Bay's co-founder, Fredrik Neij, has appealed to Sweden's Supreme Court after the Swedish Court of Appeal ruled the seizure of two of the site's original domain names was legal.

Jonas Nilsson, Neij's lawyer told TorrentFreak: "Fredrik Neij moves that the Supreme Court, by the modification and elimination of the District Court and Court of Appeal's decision, should reject the prosecutor's request for Fredrik Neij's forfeiture to the right of the domain names piratebay.se and thepiratebay.se."

Fredrik Ingblad, an anti-piracy prosecutor, filed a complaint against Punkt SE (IIS), targeting two of the Pirate Bay's oldest domain names – ThePirateBay.se and PirateBay.se – in 2013.

The IIS is responsible for managing Sweden's top-level SE domains. Ingblad claims the domains should be suspended as the Pirate Bay is an illegal site that enables copyright infringement.

In April 2015, the Stockholm District Court ruled the Pirate Bay should forfeit both domains. And iIn May 2016, the Swedish Court of Appeal ruled that Pirate Bay's both domains would be confiscated by the state for assisting in copyright infringement.

"We are pleased that the Court of Appeal chose to uphold the decision from the District Court. We think it is good that this issue has been examined. Now we need some time to read through the verdict before we can make any further comments," said IIS counsel Elisabeth Ekstand at the time.

The Court of Appeal found the domain names should be considered as intellectual property, so are owned by Neij, not the IIS. Neij is now appealing to the Supreme Court on the basis of this ruling.

"Fredrik Neij argues that the District Court and the Court of Appeal wrongly concluded that a domain name is a type of intellectual property that can be confiscated in accordance with copyright law," reads Neij's appeal.