For a workbook composed of multiple spreadsheets, select Protect Workbook followed by Unprotect Workbook. Enter the Workbook password again when prompted and select OK to remove protections.

To remove protection from the spreadsheet, open it in Excel, click the "Review" tab and then click "Unprotect Sheet" in the Changes group. Type the password into the Password field and click "OK." ...

Protecting a worksheet in Excel 2003 prevents others users from editing it. For example, if you have tracked and charted your business's sales on a sheet, you will want co-workers to access the ...