Securing a workbook
 

I have a workbook with hidden sheets/formulas/and some just data that I don't
want users to see. Is there a good way to secure the workbook/sheets. I
know I can protect each sheet, is there and advantage to protecting the
workbook as well? I don't feel very comfortable with just the protect
worksheet functions since I can google a tool to remove security in about 5
minutes. Any direction on this would be greatly appreciated.