Not Dorico related, but really don’t know where else to ask, so here goes:
As far as I understand, sheet music has its own copyright, i.e. even if the musical work itself is public domain, the copyright of the sheet music (print, engraving) also belongs to the author (copyst?). That means I can’t (photo)copy/distribute such sheet music.
But, what if I were to create my own sheet music of the same musical work, based on one or more existing engravings? Can I distribute such sheet music?