Question

Why did the Roman Catholic church imposed control over publisher and booksellers?

Answer 1

The Roman Catholic Church began keeping an index of Prohibited books from the mid-sixteenth century because its authority was being put in dangerby the several individual anddistinctive readings and questionings of faith prompted by the easily accessible popular religious literature. To supplement its inquisition and repression of heretical ideas, the Roman Catholic Church exercised strict control over publishers and booksellers, and also began to keep an Index of Prohibited Books from 1558.

Answer 2

Because they did not want people to star believe in things that were not real. They wanted people to notice hat god was real and that things inside a book were nothing but lies. (that's my guess)