Administration
The South Korean High Court has a ruling history since 1978 that has classified 1,220 books and print material as "Enemy's Expressions" by force of precedence. Two state-established research institutes decide what books and print materials meet the criteria of "Enemy's Expressions": the Democratic Ideology Institute, established in 1997 under the direct orders of the Chief Prosecutor, and the Public Safety Affairs Institute of the Korea National Police University.
However, since the early 1990s, the Public Prosecutor's Office has chosen not to bring any citizens (or publishers) to the courts for what's deemed by common sense as not risky. Courts still invoke the law when increasing fines or years in prison for political charges against what the South Korean state deems subversive groups.
Japanese lawyer Suga Matsuyuki has called for the Japanese government to recognize its involvement in North Korean spies in Japan.
Read more about this topic: National Security Act (South Korea)