Why it appeared
The reason was technology. When books were copied by hand, a dangerous text spread in dozens of copies; printing made thousands of copies possible within weeks, and older methods of control stopped working.
That was the logic behind the list. Checking every book was impossible, while a list of prohibited books made it possible to control printers and booksellers, who were the document's primary audience.
It's telling that the list appeared specifically in response to the falling cost of copying. This happens almost every time: a new technology for spreading information creates new ways to control it, and the same thing happened with radio, cinema and the internet.
It included more than theological works. Scientific papers, philosophical works and novels appeared there, from books about the movement of the Earth to literature deemed immoral.
How it worked in practice
The list's impact varied. In some countries it was strictly enforced; in others it remained almost a formality. Secular authorities often had their own lists, which did not match the church's.
There was also an intermediate option: a book could be approved after revisions. The publisher was told which passages to remove, and the text was published with omissions, without announcing exactly what had been removed.
- 1450sThe printing press appears. Print runs grow from dozens of handwritten copies to thousands of copies.
- 1559The first general list of prohibited books with binding force for Catholics is published.
- 17th centuryScientific works enter the list, including works about the movement of the Earth.
- 1966The list loses its binding force and stops being updated.
Like any prohibition, the list also worked in reverse. Appearing on it made a book more noticeable, and there are known cases of publishers deliberately seeking a mention because it boosted sales.
It also served as a source for historians. The editions of the list show what was considered dangerous in each decade, offering a fairly precise map of an era's anxieties.
The list was abolished in 1966. Formally, it ceased to have the force of law and was declared a moral guide; then it stopped being updated altogether.
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Sources
- The list of books Catholics were forbidden to read was published from the mid-16th century and included theological, scientific and literary works
- its use varied by country, and editions with omissions were used alongside complete bans. The list lost its binding force in 1966