Selecting only certain cell range VBA

I am trying to figure out how to create a VBA that will either completely disable the deletion of N5:R125 when a row is selected and the user hits the delete or backspace keys. Or when the user selects the row it will resize it to a*:o* and they can delete that range. This is a shared macro enabled book and I do not want to password protect it, which is usually the correct answer.