The Audiovisual Section of Libri Prohibiti contains three “books” – sheaves of paper – made from covers of cassettes of unofficial music groups from 1980s Czechoslovakia. The sheaves were made by the State Security (StB) from items confiscated during the prosecution of Petr Cibulka, a political activist and collector. During the 1980s, Cibulka recorded both concerts and amateur studio recordings, which he then produced and distributed in his samizdat record label S.T.C.V. (Samizdat Tapes & Cassettes & Video). Cibulka’s collection – hundreds of recordings and covers – was probably the biggest private collection before 1989. Cibulka was, because of these activities, sued in 1988 and imprisoned for “unjust enrichment” and his collection was confiscated by StB. The sheaves should have been evidence of his activities. A lot of original cassette covers were made from photo paper. The “books” therefore testify to the originality of producers of samizdat recordings. The item was presented on the travelling exhibition COURAGE “Risk Factors: Collections of Cultural Opposition” between 21 September and 28 October 2018 in the National Monument in Vítkov, Prague.