title: MPDF create read only pdf file?
body: <p>I'm using mpdf to download an existing file like this-</p>
  
  <pre><code>$mpdf-&gt;Output('my_filename.pdf','D'); 
  </code></pre>
  
  <p>I need the file downloaded to be read only. Right now the downloaded files can be opened in word and edited, I wish to avoid that.</p>
  
  <p><strong>TL;DR</strong> :
  I'm downloading an existing file from my system which my clients can edit by opening in word, need to avoid that.I can't have password protection for the files(client requirement)</p>