A $50 portable media player is providing many North Koreans a window to the outside world despite the government's efforts to keep its people isolated, a symbol of change in one of the world's most repressed societies.

By some estimates, up to half of all urban North Korean households have an easily concealed "notel," a small portable media player used to watch DVDs or content stored on USB sticks that can be easily smuggled into the country and passed hand to hand.

People are exchanging South Korean soaps, pop music, Hollywood films and news programs — all of which are expressly prohibited by the Pyongyang regime, according to North Korean defectors, activists and recent visitors to the isolated country.