I don't know if you work for evernote or not but let me tell you something about customers. I own a business and when a customer has a suggestion, especially when several of them have one I at least listen to them. If I have a word document or exel file I can lock them. I understand all the things you are saying I can do but they are not what I choose to do for my own reasons. I'm just saying I would like the option to lock a notebook. If that's not possible then that's just the way it is. I do like Evernote, I've used it for several years and subscribe to the premium. I use it quite a lot to make notes on potential jobs before I go back to the office and make out a quote.