Newsnight's Sue Lloyd-Roberts has visited North Korea on an official trip to view celebrations marking the birthday of the country's founder Kim Il-sung.

The secretive Stalinist state does not allow access to the World Wide Web, and instead has its own version - a closed intranet on which carefully selected information is made available to users.

Here Sue Lloyd-Roberts takes a look at the system and talks to university students about what they know of the outside world.

Watch Sue Lloyd-Roberts' full film from inside North Korea on Newsnight on Tuesday 1 June 2010 at 10.30pm on BBC Two, then afterwards on the BBC iPlayer and Newsnight website.