title: converting video src to a single-session blob url
body: <p>Let's say I have a <code>video</code> element on my website:</p>
  <pre><code>&lt;video src=&quot;/video.mp4&quot; controls=&quot;&quot; id=&quot;video&quot;&gt;&lt;/video&gt;
  </code></pre>
  <p>How do I go about protecting the <em>original source</em> file (<code>/video.mp4</code>) by converting it to a single-session <em>Blob URL</em>?</p>
  <p>I have seen a few posts stating that it needs to be done with <strong>JavaScript</strong>, though none of them actually expand on the necessary details explaining how to do it (or where you can find out how).</p>
  <p>So, what is the best approach for something like this?</p>