Kim Dotcom says he is about to go on the offensive, after the news that some of the files prosecutors allege Megaupload.com knew were pirated and did not remove were only present because courts had asked they be retained to assist another investigation.

Dotcom's new assault will be based on revelations that megaupload actively co-operated with US authorities on several piracy cases, one of which concerned an outfit named NinjaVideo that used megaupload to store some its files. Megaupload was asked by the US Department of Justice (DoJ) to preserve those files, to assist the ongoing investigation.