What other major conditions apply, how is the status obtained, and what renewal, document-validity, retention or loss rules matter?
Under Article 79 of the Rason Economic and Trade Zone Law (consolidated text with amendments through 3 December 2011), foreigners may enter, leave, stay or reside in the Zone, and may enter or leave via the designated route, without a visa, on presentation of a passport or other equivalent pass. The official source does not state the renewal, retention or loss rules for the certificate.
See recorded sources
Limits of the record- Sanctions caveat (applies to this Zone-based route): UN Security Council Resolution 2375 (2017), paragraph 18, requires states to prohibit their nationals from opening, maintaining or operating joint ventures or cooperative entities with DPRK entities or individuals, new or existing, unless approved case-by-case by the Security Council's 1718 Committee. A DPRK domestic legal permission to enter, stay or reside in the Zone does not by itself indicate that international investment, business or joint-venture activity there is normally available to a given applicant -- that depends on the applicant's own country's sanctions compliance and any required Committee approval, which this route does not establish.