Actually I saw it. Maybe I should write my question more specifically, sorry for misleading.
I still do not understand "note publishing" option with e2ee. Have you mentioned it in this article?
Speaking about Notebooks, what happens if I cancel subscription, does e2ee return?
And yes, I believe it is better to exchange keys with users and have permission setup in case of sharing notebooks. Another close to real workflow suggestion is to have "commenting" on blocking note (published note). It is very useful when you, for example share with a team minutes, roadmaps. Blocking note prevents unexpected changes and commenting gives you a feedback.