Today, we are inclined to believe that intellectual freedom has no greater adversary than the censor. In eighteenth-century France, the matter was more complicated. Royal censors envisioned themselves not as fulfilling a mission of state-sponsored repression but rather as guiding the literary traffic of the Enlightenment. By awarding pre-publication and pre-distribution approvals, royal censors sought to insulate authors and publishers from the scandal of post-publication condemnation by parliaments, the police, or the Church. Less official authorizations were also awarded. Though censors did...