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In page Telecommunications in North Korea:

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Visitors are not allowed to bring a radio. As part of the government's information blockade policy, North Korean radios and televisions must be modified to receive only government stations. These modified radios and televisions should be registered at special state department. They are also subject to inspection at random. The removal of the official seal is punishable by law. In order to buy a TV set or radio, North Korean citizens are required to get special permission from officials at their places of residence or employment.[citation needed]