The Supreme Court has on Thursday ruled they do have jurisdiction to hear the case against extradition of Kim Dotcom and his co-accused.
The United States government had previously argued that the Supreme Court did not have this authority, after the group's appeals to the High Court and the Court of Appeal were both unsuccessful.
On Thursday afternoon, Justice William Young said the Supreme Court did hold this jurisdiction, and the case would be heard.
The Supreme Court is the highest Court in New Zealand, and hearings are accepted on a case-by-case basis.
If Dotcom's appeal to the Supreme Court fails, the decision whether to extradite the group will fall to Justice Minister Andrew Little.
In 2012, the US filed an indictment against Dotcom and his associates, accusing them of racketeering and money laundering.
He was the owner of now-defunct site MegaUpload, which was accused of being a hub for the illegal sharing of copyrighted content.
The US has sought the extradition of the group since 2012.
The case was first before a New Zealand court in 2015, where the group began their long run of legal battles, which will see them take to the Supreme Court for a final round.