Reference>IXLSWorkbook>UnProtect

Removes protection from a workbook. This method has no effect if the workbook isn't protected.

Syntax

procedure UnProtect();

procedure UnProtect(Password: string);

procedure UnProtect(Password: string; lcid: integer);

Password	String. A string that denotes the case-sensitive password to use to unprotect the workbook. If the workbook isn't protected with a password, this argument is ignored.
lcid	Integer. The locale ID.

This example removes protection from the workbook.

workbook.UnProtect('mypass123');