My use of Evernote is divided between Notebooks where I actively add, remove, and edit information and another set of notebooks that serve as my library. The library notes and notebooks are predominantly pdf files of books and articles that I use in my teaching / research.
I would very much like to be able to "lock" or prevent a note from being edited without an extra step. Sometimes (especially when using Evernote on a tablet or my phone), I have accidentally deleted information about the pdf or even the pdf itself. "Locking" the note would require you to "unlock" it in order to type