New Zealand police have been praised by the White House for their role in the case against Kim Dotcom.
But the extent of that praise is a secret in New Zealand - police headquarters says any thanks from the United States would be covered by a confidentiality clause applied to correspondence with foreign law enforcement agencies.
Dotcom and three others were arrested by the New Zealand police's elite special tactics group in January as part of an FBI operation against his Megaupload website, which is accused of being a front for huge internet piracy.
The US attorney prosecuting the case, Jay Prabhu, was present at the North Shore Police Station in Albany - just kilometres from Dotcom's mansion - during the raid.
The operation was timed by the FBI to unfold across the world at the same time as Hong Kong's Customs and Excise staff were carrying out raids on the company headquarters.