The collection presents selected works from the National and University Library's collection, which were in the past marked as religiously, morally or politically controversial and listed on the Papal Index and other, mainly imperial censorship lists. The works were displayed at the exhibition And Yet They Read Them – Banned Books in the Early Modern Age. It was part of the Banned Books on Slovenian Territory in the Early Modern Age research project, and was prepared in 2018 by the Research Centre of the Slovenian Academy of Sciences and Arts, and NUL.