The Chinese government regulates the creation and distribution of materials regarding Chinese history. Particular emphasis is placed on combatting "historical nihilism". The CCP's historical research body, the Central Committee Party History Research Office, has defined historical nihilism as that which "seek to distort the history of modern China's revolution, the CCP and the armed forces under the guise of reevaluating existing narratives", and thus countering such nihilism is "a form of political combat, crucial to the CCP leadership and the security of socialism". In practice, the term is often applied to any narratives that challenge official views of historical events. Under Xi Jinping, the government began to censor digitized archival documents that contradict official depictions of history.