Chart.Unprotect (Excel)
Removes protection from a sheet or workbook. This method has no effect if the sheet or workbook isn't protected.
If you forget the password, you cannot unprotect the sheet or workbook. It's a good idea to keep a list of your passwords and their corresponding document names in a safe place.
Unprotect (Password)
Password: A string that denotes the case-sensitive password to use to unprotect the chart. If the chart isn't protected with a password, this argument is ignored.
ActiveChart.Unprotect