title: Password Protect XSSFWorkBook Apache POI
body: <p>I need to password protect XSSFWorkBook. For HSSF, I am able to do it easily but the same implementation is not working for XSSFWorkBook.</p>
  
  <p>I am using Apache POI 3.6 and 3.9 both. I mean I tried using both 3.6 and 3.9.</p>
  
  <p>I guess I need to use POIFSFileSystem but can anyone guide me for the same. </p>