title: Playing widevine drm dash url on ios swift
body: <p>I want to play widevine url on ios,is there any player in ios similar to android exoplayer that supports widevine DRM,right now in android i am able to play widevine mpd file</p>
  
  <p>exception:</p>
  
  <pre><code>[ERROR:/Developer/playground/google3/third_party/video/widevine/cdm_release/core/src/license.cpp(452)] CdmLicense::HandleKeyResponse: unable to parse signed license response
  [ERROR:/Developer/playground/google3/third_party/video/widevine/cdm_release/core/src/cdm_engine.cpp(312)] CdmEngine::AddKey: keys not added, result = 70
  [ERROR:/Developer/playground/google3/third_party/video/widevine/cdm_release/cdm/src/cdm.cpp(497)] Unexpected error 70
  </code></pre>