said by Federal Prosecutors :
Mr. Goodwin has yet to demonstrate whether he has an interest in any property seized by the government, the authorities said in a brief filing. The government added that the mere fact that he may claim, for example, an initial copyright to a version of the files he uploaded is not sufficient to establish that he has an ownership interest in the property that is the subject of this motion.
So basically the government is saying that proving their baseless claim that the material isn't his would be too difficult, so the court should just accept the government's allegation.
It shouldn't be up to the individual to prove the material is his. It is up to the government to prove it isn't. No one is disputing the fact that some of the data megaupload hosted is pirated, but blindly claiming everything is, AND expecting the court to just believe that without any proof what so ever, is just complete bullshit.