I want to share a notebook with a group of students, in such a way that they can interact with it, but it can´t be saved. Each user should make a copy in case he wants to save his work, but the original must be kept without changes. (For example, the way the online help works allows one to interact and try things, but the changes will not affect the original). Using the option saveable->False in the Option Inspector won't do, since it can be changed by the user in an active session. Any suggestion will be appreciated.