Removes protection from the workbook. This method has no effect if the workbook is not protected.
public void Unprotect (object Password);
The case-sensitive password to use to unprotect the workbook. If the workbook is not protected with a password, this parameter is ignored. If you omit this parameter for a workbook that is protected with a password, the method fails.
If you forget the password, you cannot unprotect the workbook. It is a good idea to keep a list of your passwords and their corresponding document names in a safe place.
For information on optional parameters, see Optional Parameters in Office Solutions.