Lets say I have a file that is on a shared drive that multiple users use. The
file is not saved as a shared workbook. The file is password protected and
all users know password. Is there a way to restrict the users from changing
the password when they are re-protecting the workbook after they have made
changes?

I also have found that if I protect a work book some one who has the
password can then protect and share the work book putting a new password over
mine thus now not allowing me to edit the workbook. Is there any way to
restrict users from doing this?