i'm trying to make a workbook which "difficult" to password-removed with some
password removal application

i need it because i need to protect some cells from some people who had that
cracking application, but theu vba knowledge is relatively below average

if possible, i want to make the protection couldn't be break at all
but if it's not possible, at least i wan't it to be difficult to break,

the workbook will protect itself when the sheet activate or the cell selected
but it's not enough
some of them will break the vba password with an application
so i shared the workbook so that the vba is unviewable
and i delete the shared menu from the tools commandbar
i know this is not enough
they could reset the menu from a new workbook

in the attachment, i tried to make ones
try to break it, and give me a suggestion how to make it more secure