title: Using Azure Media Services to deliver DRM licenses with shaka packager?
body: <p>I am building a subscription based Video On Demand service. For content protection I choose <strong>Widevine</strong> &amp; <strong>Azure Media Services</strong> for License delivery which costs US$0.20 for 100 licenses. Shaka Packager for media packaging.</p>
  
  <p>I followed <a href="https://docs.microsoft.com/en-us/azure/media-services/previous/media-services-deliver-keys-and-licenses" rel="nofollow noreferrer">this guide</a> &amp; got :</p>
  
  <pre><code>Created key nb:kid:UUID:d2c69XXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX with key value XXXXXXXXXXXXXXXXf7Kc7g==
  PlayReady License Key delivery URL: https://xxxxxxx.keydelivery.centralindia.media.azure.net/PlayReady/
  Widevine License Key delivery URL: https://xxxxxxx.keydelivery.centralindia.media.azure.net/Widevine/?KID=d2c69XXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
  Added authorization policy: nb:ckpid:UUID:5274f7da-XXXX-XXXX-XXXX-XXXXXXXXXXXX
  </code></pre>
  
  <p>Shaka Packager <a href="https://google.github.io/shaka-packager/html/tutorials/widevine.html" rel="nofollow noreferrer">Documentation</a></p>
  
  <pre><code>$ packager &lt;stream_descriptor&gt; ... \
    --enable_widevine_encryption \
    --key_server_url &lt;key_server_url&gt; \
    --content_id &lt;content_id&gt; \
    --signer &lt;signer&gt; --aes_signing_key &lt;aes_signing_key&gt; \
    --aes_signing_iv &lt;aes_signing_iv&gt; \
    [Other options, e.g. DASH options, HLS options]
  </code></pre>
  
  <p>So I have <code>key_server_url</code> , <code>content_id</code></p>
  
  <p>where do I find <code>aes_signing_key</code> &amp; <code>aes_signing_iv</code> ?</p>