NZ police raided internet tycoon Kim Dotcom's mansion in January and seized his assets after US officials asked for assistance under an international agreement.
He was arrested, along with three other executives of the Megaupload file sharing site, and were charged with criminal copyright violation. They have all said they will fight the charges.
A High Court decision has since ruled the raid illegal because it was based on invalid search warrants.
A hearing into his extradition to the United States is due to be heard next March.
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