A federal judge in Washington has issued a key order in one of the many ongoing mass-BitTorrent piracy lawsuits in the United States. The judge ruled that a complaint from the "Elf-Man" movie studio is insufficient because the IP address evidence does not prove that an account holder is guilty of copyright infringement.

Mass-BitTorrent lawsuits have been dragging on for years in the US, involving hundreds of thousands of alleged downloaders.

A common problem with these cases is that copyright holders only have an IP address as evidence, which generally can’t identify a movie pirate.

Judges who handled similar cases in the past have made observations along the same lines and now Washington District Judge Robert Lasnik has added his opinion, ruling that IP address-only evidence fails to meet the pleading standards required to pursue for copyright infringement.

The case in question involves the makers of the movie Elf-Man, who sued hundreds of people for being involved in pirating their film using BitTorrent. The studio alleges that the IP address assigned to each defendant was monitored sharing a pirated version of the film.

More specifically, the complaint alleges that the defendants either (a) downloaded the pirated film themselves, or (b) permitted, facilitated, or promoted the use of their Internet connections by others to download the film.

While the above may be accurate in some cases, it’s not good enough for a copyright infringement claim. Ruling on a motion to dismiss filed on behalf of one of the defendants, Judge Lasnik notes that part (b) is not a valid claim.

“[The movie studio] has actually alleged no more than that the named defendants purchased Internet access and failed to ensure that others did not use that access to download copyrighted material,” Lasnik states.

In other words, the complaint itself states that the account holder may not be the person who downloaded the movie, which isn’t enough to pursue the case.

“Simply identifying the account holder associated with an IP address tells us very little about who actually downloaded ‘Elf-Man’ using that IP address,” Judge Lasnik writes.

“While it is possible that the subscriber is the one who participated in the BitTorrent swarm, it is also possible that a family member, guest, or freeloader engaged in the infringing conduct,” he adds.

As a result, the defendant’s motion to dismiss was granted because the movie studio failed to state a claim for direct copyright infringement, contributory infringement and indirect infringement. The copyright holder is allowed to file an updated complaint, but doubts that the movie studio will be able to make a valid claim.

The ruling is crucial as it confirms that an IP address is not enough evidence in these cases, and that account holders are not legally responsible per se for others who may pirate on their connection. Or at least, that an IP address alone is not enough to launch a copyright infringement lawsuit.

As noted by troll watcher SJD the order is a win for the many people involved in similar cases. “This is yet another nail (and a pretty sharp one) in the coffin of copyright trolling,” she writes.

Elf-Man’s main star Jason Acuna probably won’t mind the outcome, as he previously distanced himself from the lawsuits in question.

“I’m not backing it at all.. Has NOTHING to do w/ me!! It’s all them..,” he wrote on Twitter.