DEMOCRATIC PEOPLE’S REPUBLIC OF KOREA 15 proclamations stating that those caught would be sentenced to death. According to KINU’s white paper for 2019, the number of persons executed for watching or distributing South Korean video content increased in recent years, with additional reports of correctional labor punishment. In December 2019 the HRNK reported the government’s introduction of a file watermarking system on Android smartphones and on personal computers that adds a user- or device-specific data string to the end of the filename of any media file each time it is shared. Based on defector interviews conducted in 2015, InterMedia estimated as many as 29 percent of defectors listened to foreign radio broadcasts while inside the country and that approximately 92 percent of defectors interviewed had seen foreign DVDs while in the country. The HRNK reported that younger individuals preferred foreign digital video content to foreign radio broadcasts. The government maintained efforts to prevent the import of South Korean popular culture, especially television dramas. According to media and NGO reports, police could search homes to enforce restrictions on foreign films. According to the HRNK, the government added a software-based censorship program known as the “signature system” to all domestic mobile telephones. This system makes it impossible to view foreign media on mobile phones. Mobile phones were randomly inspected physically for illegal media, and a history of all activity on the device was available for export upon inspection through monitoring software called TraceViewer. In October 2019 NW News reported that Kim Jong Un created a special police unit to restrict and control the flow of outside information into the country. Academic Freedom and Cultural Events The government restricted academic freedom and controlled artistic works. School curricula were highly controlled by the state. The government severely restricted academic travel. The primary function of plays, movies, operas, children’s performances, and books was to buttress the cult of personality surrounding the Kim family and support of the regime. The state carried out systematic indoctrination through the mass media, schools, and worker and neighborhood associations. Such indoctrination involved mass marches, rallies, and staged performances, sometimes including hundreds of thousands of persons. b. Freedoms of Peaceful Assembly and Association Country Reports on Human Rights Practices for 2020 United States Department of State • Bureau of Democracy, Human Rights and Labor