Just to clarify the situation here..
Basically, Norway didn't have any laws to that could cover such extreme crimes. (Except perhaps for secret wartime laws and such)
The strongest sentence we can give is for murder, max 21 years. There are however laws that can extend his sentence indefinitely, 5 years at a time, if they find he can still be a threat to society. So in practice I'm pretty sure he never gets out.
Again, the rights for prisoners in Norway are meant for normal criminals, but in the eyes of the law, they are all the same.
Just our system was never built or prepared to deal with cases like this. It was simply not imaginable.
Still, I think they are trying to punish him as hard as they can within what the rules allow.. By controlling all communications, daily body inspections, giving him a ps2 with nonviolent children's games, very little human contact etc.. If they break the rules in their punishment, his lawyers will be on it and he will have a little personal victory. This is the last thing they want.