title: VBA code to unprotect a opened powerpoint presentation, then protect it again before saving it?
body: <p>I protected a power point presentation from user modifying it. However I can't use VBA to un-protect it. </p>
  
  <p>I tried to use this code below but it doesn't work. It only works for unprotected presentation. But you will have to remove the pw from the code. </p>
  
  <pre><code>set p = pa.presentations.open(pth + pptname, pw)
  </code></pre>