title: Remove exiftool traces from file
body: <p>If I set some tag with exiftool e.g.</p>
  
  <pre><code>exiftool UserComment="test" video.mp4
  </code></pre>
  
  <p>I can then remove it with</p>
  
  <pre><code>exiftool UserComment= video.mp4
  </code></pre>
  
  <p>However, exiftool sets an additional tag <code>ExifToolVersion</code> which I cannot delete with</p>
  
  <pre><code>exiftool -ExifToolVersion= video.mp4
  </code></pre>
  
  <p>because</p>
  
  <pre><code>Warning: Sorry, ExifToolVersion is not writable
  </code></pre>
  
  <p>How can I remove all traces of exiftool from the file? I need to keep other meta data tags untouched.</p>