In the era of handwritten parish registers, when a diocesan or missionary priest performed a sacramental rite, he wrote it up in a semi-structured form in a record book. Sometimes that priest was the only literate person around, making the parish books essentially internal documents, but some parishioners were literate too. Who was allowed to look at church registers: only priests, anyone the priest saw fit to share it with, or anyone at all that was interested? Did canon law and local practice differ on this point?
Modern norms might be different because of the legal concept of privacy, so this question is about the past. I am particularly interested in the policy of Franciscans in the Spanish Empire, but information on how this was addressed elsewhere could be helpful too. I have the specific case of a recently converted godparent who was described in the register as falsely pious; the remark was presumably not meant for the public. Who did the priest expect would ever be able to read it?