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||This work was first published on the North Korea and is now in the public domain because its copyright protection has expired by virtue of the Copyright Law of the Democratic People's Republic of Korea, enacted 2001, amended 2006. The work meets one of the following criteria:
- It is a work of an institution, enterprise or organization and 50 and years have passed since the date of its publication
- It is another kind of work, and 50 years have passed since the year of death of the author (or last-surviving author)
- It is a "work whose publication, issuance, performance, broadcasting, show and exhibition is prohibited" in the Democratic People's Republic of Korea
- It is one of "Documents for state management [...] unless commercial purpose is pursued"