Widevine DRM 在 Google Cast 上加密播放

问：

无法使用 Google Cast 播放加密内容，.mpd 格式的 Open URL 在 Android TV Cast 中正常工作。

代码如下：

MediaMetadata movieMetadata = new MediaMetadata（MediaMetadata.MEDIA_TYPE_MOVIE）;

    movieMetadata.putString(MediaMetadata.KEY_SUBTITLE, studio);
    movieMetadata.putString(MediaMetadata.KEY_TITLE, title);
    JSONObject jsonObj = null;
    try {
        jsonObj = new JSONObject();
        jsonObj.put(KEY_DESCRIPTION, subTitle);
        jsonObj.put("widevineLicenceUri", "https://vsd02fy1.anycast.nagra.com/VSD02FY1/wvls/contentlicenseservice/v1/licenses");
        jsonObj.put("token", "eyJraWQiOiI4MTI0MjUiLCJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.fZpotjTjiddueE_nPVcON0FnJwBO4FecTcYIoMmocnw,eyJrY0lkcyI6WyIwMjA4MTEzZS1lNmU4LTQyNDItODY3Yy1kOTYzZjVkNzg5MjMiXSwidHlwIjoiSldUIiwiZW5jIjoiQTEyOENCQy1IUzI1NiIsImFsZyI6ImRpciIsImtpZCI6IjgxMjQyNSJ9..ntJUOAc-g8sXrGLjZhx-MQ.nHnm-aciNeCz6kwUZEjOQgg-1PsLN1Uc8eYihUv_OUK8EaBoFH7JcdIyB9igEFfR9Cufau_5H-EvTdrmws20_ViWKjUTOZmUn7xPQOmwSftb99-rgd3g4QZO0quHIDB5qiBoKmksts8qDbcMZbr_aKMFIOlzNUUcBwiOvmrGyzo.-zTh5sY7tmbe7Ow94EQT9A");
    } catch (JSONException e) {
        Log.e(TAG, "Failed to add description to the json object", e);
    }

    return new MediaInfo.Builder(url)
            .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
            .setContentType(mimeType)
            .setMetadata(movieMetadata)
            .setStreamDuration(duration * 1000)
            .setCustomData(jsonObj)
            .build();

尝试使用具有 .mpd 格式的开放 URL 和以下 URL： https://commondatastorage.googleapis.com/gtv-videos-bucket/CastVideos/dash/BigBuckBunny.mpd & 它工作正常

需要使用加密 URL 将视频投射到电视上