The Japanese NGO (non government humanitarian) group in support of freedom in North Korea and safety for North Korean refugees, R.E.N.K., has released secret, internal North Korean Workers (Communist) Party documents which indicated substantial concern by the regime's authorities about smuggling that involved Western influences/documents/videos, etc. reaching North Koreans, as well as secret North Korean Party documents making it to the outside.

Here is one of the North Korean internal documents showing heightened concern (cover page). "American, in Tokyo" has been a very reliable source on these things

Clarice Feldman   11 22 04