Yet the process of disfiguring their arguments, effacing the names of authors, expunging the praises of heretics, altering quotations and retouching them all over, involved so much labor that the demand was never satisfied.

The strict search instituted at the frontiers stopped the importation of books,[131] and carriers refused to transmit them.

In their dread of the Inquisition, these folk found it safer to abstain from book traffic altogether.
Public libraries were exposed to intermittent raids, nor were private collections safe from such inspection.

The not uncommon occurrence of old books in which precious and interesting passages have been erased with printer's ink, or pasted over with slips of opaque paper, testifies to the frequency of these inquisitorial visitations.[132] Any casual acquaintance, on leaving a man's house, might denounce him as the possessor of a proscribed volume; and everybody who owned a book-case was bound to furnish the Inquisitors with a copy of his catalogue.
Book-stalls lay open to the malevolence of informers.

We possess an insolent letter of Antonio Possevino to Cardinal Sirleto, telling him that he had noticed a forbidden book by Filiarchi on a binder's counter, and bidding him to do his duty by suppressing it.[133] When this Cardinal's library was exposed for sale after his death, the curious observed that it contained 1872 MSS.