The Mage can copy and existing grimoire without knowing the rotes it contains or even how to properly read the text.
The caster cannot alter the language, organization or basic appearance of the copy from the original except for a few minor deviations in materials and penmanship. Once the caster is finished, the new grimoire contains all of the rotes of the original. The copy even retains any magical curses or safeguards contained in the original as long as those were part of a combined spell that created the original. The copy functions just as a standard grimoire, though this spell is often used to reproduce books that are difficult to understand.
This spell cannot copy a daimonomicon unless it incorporates the master-ranked arcanum used to create that work in the first place.
Mysterium Rote: Illuminated Hand
Mystagogues copy grimoires such as the Corpus Mysteriorum to pass on its knowledge and demonstrate their devotion to knowledge.