[ISOBMFF]], the ISO Common Encryption protection schemes may be
        detected as follows.
      </p>
      <p>
        Protection scheme signaling conforms with [[ISOBMFF]]. When protection
        has been applied, the stream type will be transformed to 'encv' for
        video or 'enca' for audio, with a Protection Scheme Information Box
        ('sinf') added to the sample entry in the Sample Description Box
        ('stsd'). The Protection Scheme Information Box ('sinf') will contain a
        Scheme