Dotcom, who lives in Auckland, New Zealand, has vowed to fight the decision to extradite him to the USA.
If he loses, he faces a number of charges including money laundering, copyright breaches and racketeering.
These charges carry hefty penalties in the USA.
Big Content alleges that Dotcom has cost them as much as $500 million.
Three years ago, US enforcers shut down his megaupload.com web site and laid charges against Mr Dotcom, who changed his surname from Schmitz to reflect the zeitgeist.