It's one of the most common biases for historians: anachronicity, it's about looking to people in the past with the goggles from the present (current biases, and/ or values). Furthemore, priests copying books by hand was extremely common before the invention of the printing press.

I wonder if this case is special for its time (the first copyist?) or book (was it protected by any hierarchy?).. Other than that, I agree and fail to see a salient connection to "our" piracy.

I'd rather keep the origins on musical pieces, probably classical music. Which is difficult to get even to this days (too niche, some popular pieces have scanned PDFs tho)