title: Meaning of YouTube "-nocookie: and "rel=0" in the iframe embed code
body: <p>If I copy the embed code from a YouTube video I get the code below.</p>
  
  <pre><code>&lt;iframe width="560" height="315" src="//www.youtube.com/embed/kk5xfK0ovrk" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>And if I select a 1280x760 size for the video and copy that embed code I get:</p>
  
  <pre><code>&lt;iframe width="1280" height="720" src="//www.youtube-nocookie.com/embed/kk5xfK0ovrk?rel=0" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>But if I just take the original embed code and only change the width to 1280 and height to 720 I also get a perfectly good 1280x760 video. So I'm wondering what the purpose is of the "-nocookie" and the "rel=0" in the code YouTube generates for the 1280x560 case.</p>
  
  <p>Thanks</p>