* @param password to set for protection. Pass <code>null</code> to remove protection
*/
public void protectSheet(String password) {
if(password != null) {
CTSheetProtection sheetProtection = worksheet.addNewSheetProtection();
sheetProtection.xsetPassword(stringToExcelPassword(password));
sheetProtection.setSheet(true);
sheetProtection.setScenarios(true);
sheetProtection.setObjects(true);
} else {
worksheet.unsetSheetProtection();
}
}