So I have a workbook that multiple people need to see. In the workbook, I am hiding multiple sheets. I need to block all external links from being able to access my workbook and view the hidden sheets. I know this is not 100% perfect as anyone with some programming knowledge can unlock my workbook, but I don't want it to be so easy that a novice can just do a " = hiddenSheet!A1" as well. Is this possible with excel or what is a product that we can use for our company?