The Tridentine Index of 1564 presented ten rules that were established by the Council of Trent to control the censorship of texts. In the Index librorum prohibitorum that accompanies this 1664 edition of the Council's decrees, the ten rules were reprinted in full. These rules were expanded and modified over the centuries, but they remained the core determinants for Catholic censorship until use of the Index librorum prohibitorum was discontinued in 1966.
AFH7502. Council of Trent (1545–1563). Sacros. Concilium Tridentinum: Editio reformata . . . cum indice librorum prohibitorum ex praescripto Concilii. Cologne: Johannes Busaeus, 1664.
Council of Trent (1545–1563 : Trento, Italy), Gallemart, Joannes, d. 1625, and Busäus, Johann, active 1659–1669, printer., “AFH7502,” Bridwell Library Special Collections Exhibitions, accessed October 6, 2022, https://bridwell.omeka.net/items/show/1928.