Kim Dotcom has been given permission to live-stream his upcoming court case on Youtube.
Kim Dotcom is in court to appeal against being forced to go to America and face charges against copyright law. This is called being extradited.
A district court ruled last December that the men were eligible for extradition.
The issues being discussed could set both national and international legal standards around copyright.
Being shown on YouTube means that millions of people around the world will be able to watch it.
Justice Murray Gilbert granted the application but said any footage must be removed as soon as the six-week hearing was over.
The footage would also be streamed with a 20 minute delay, to allow the court to prevent any suppressed material from being published.