drmInfo() {
    return this.drmEngine_ ? this.drmEngine_.getDrmInfo() : null;
  }
Get the drm info used to initialize EME. If EME is not being used, this
will return <code>null</code>. If the player is idle or has not initialized
EME yet, this will return <code>null</code>.

@return {?shaka.extern.DrmInfo}
@export