Obviously I realise Pressbooks use a form of ex libris, passive watermark, for free output. What is the best way to implement such a watermark on a stand alone instance of PB? I want to be able to have a free and open platform and only charge users for later removing this watermark by manually removing it and doing further architecting and refining of the ebook by using our in-house desktop tools, should the user wish i.e. I don’t strictly need it to work in the way I imagine it does so at PB - presumably you are able to switch-off the watermark feature via a network plug-in? (possibly Pressbooks VIP, would that be, looking at diagnostics?) - though this option would be great.
Another alternative would be for the ability to restrict a user to create only one book per account. Can I do this through ‘User Accounts May be Registered’ (presumably that prevents a registered user from creating any book?)