Q. Do Jewish books get a blessing before they are printed?
In the case of rabbinic books this kind of commendation is called a Haskamah, an approval or approbation.
In 16th century Italy the rabbis meeting at Ferrera decided that Hebrew books had to be approved by three rabbis and a layman prior to publication, with the aim of preventing offensive material being published and causing dissension in the community.
Modern-day rabbinic writings often carry the Haskamah of one or more leading authorities as testimony to the religiosity and expertise of the author.
Not all Jewish books bear a Haskamah but the same purpose is often served by a book launching in which a leading personality commends the book to the public.