yes we're going for a sustainable practice of the Dark Arts,
(which honestly means mostly, just sustaining the number of practitioners, i.e. teaching them how to avoid getting eaten by what they summon)
even more importantly, the ancient words only really 'come alive' when written to, and read from, actual skin
(and of course we only use skin from certified ethical sources)
if you print out the spells on plastic or industrial paper, it becomes just so many squiggles and gobbledygook,
and in fact that's one of the reasons for the supposed historic 'decline of magic' ...
back in the day when almost anything written, was set down by hand on parchment, spellbooks were powerful
with the dawn of mass printing, it turned out,
that while for instance mathematical knowledge was transferrable independent of the medium it's printed on,
the same is not true of wizardry and witchcraft, and any mass-replicated spellbook is basically just a halloween prop...
"When I said I expect a certain amount of from my students", sighed the Instructor of Dark Arts,
argh, mangled quote,
"When I said I expect a certain amount of
self-sacrifice from my students"