Bao Tong
taken measures to block or censor related information, in an attempt to suppress the public's memory of the Tiananmen Square protests. Textbooks contain little, if any, information about the protests. After the protests, officials banned controversial films and books and shut down many newspapers. Within a year, 12% of all newspapers, 8% of all publishing companies, 13% of all social science periodicals, and more than 150 films were either banned or shut down. The government also announced that it had seized 32 million contraband books and 2.4 million video and audio cassettes. Access to media and Internet resources about the subject are either restricted or blocked by censors. Banned literature and films include "Summer Palace", "Forbidden City", "Collection of June Fourth Poems", "The Critical Moment: Li Peng diaries" and any writings of Zhao Ziyang or his aide Bao Tong, including . However, contraband and Internet copies of these publications can still be found.