Worksheet.Unprotect Method (Excel)
Removes protection from a sheet or workbook. This method has no effect if the sheet or workbook isn't protected.
expression A variable that represents a Worksheet object.
A string that denotes the case-sensitive password to use to unprotect the sheet or workbook. If the sheet or workbook isn't protected with a password, this argument is ignored. If you omit this argument for a sheet that's protected with a password, you'll be prompted for the password. If you omit this argument for a workbook that's protected with a password, the method fails.