§1. The prescripts of can. 838 are to be observed concerning liturgical books.
§2. To reprint liturgical books, their translations into the vernacular, or their parts, an attestation of the ordinary of the place where they are published must establish their agreement with the approved edition.
§3. Books of prayers for the public or private use of the faithful are not to be published without the permission of the local ordinary.
Source: Code of Canon Law (Vatican.va)