But what about the elephant in the room this question brings up: Maybe it SHOULD be possible to lock books so that only people with permission can actually write notes in a book.
(Yes, I know each users’ notes are kept in a separate HTML file in each project folder and the various comments are tracked with GUIDs. So I suspect adding a lock to a book for a particular user might be very complicated with this kind of implementation. But that doesn’t address the “use-case” where it would be nice to stop people from commenting on books they have not business making notes in.)
So the answer is “No, you can’t.” but might it not be a feature people would find useful and possibly worth implementing?