Article:
http://www.slate.com/articles/technolog ... korea.html
Excerpt:
[...] He also confirmed the physical monitoring of internet access. But despite the Koryolink mobile network censorship, blocking at the universities is still limited—because it’s not really necessary. North Koreans learn self-censorship from an early age. It’s key to survival, so few would ever dare attempt to sneak visits to websites that might get them in trouble. The stakes for their lives and those of their families are too high.