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"One of the most underrated realities about North Korea is its very dynamic relationship with China, and the amount of information that flows across that border. Students; business people; it's a continuous stream of traffic," says Steven Linton, an American aid worker in North Korea. With that traffic come thousands of DVDs, CDs, cellular telephones, used computers and videotapes -- many of them from China and South Korea.

Many Koreans in China make a living by setting up satellite TVs at their homes to receive South Korean media. Then, they burn CDs and DVDs of the programs and sell them to North Koreans for a profit. These media are so prevalent inside North Korea now that knowledge about South Korea has become commonplace, says Yoo Ho-yeol, a professor at Korea University in Seoul. Yoo regularly talks to students and refugees from North Korea.

http://www.npr.org/templates/story/story.php?storyId=127836840