In principle, any person is allowed to travel to North Korea; only South Koreans and journalists are routinely denied, although there have been some exceptions for journalists.
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North Korea - Level 4: Do Not TravelDo not travel to North Korea due to the continuing serious risk of arrest and long-term detention of U.S. nationals.
North Korea has strict laws about what you can bring into the country. It's illegal to bring in religious, pornographic or political items. Declare all published material and electronic devices when you arrive. It's also illegal to knowingly or unknowingly possess items that breach North Korean law.