diff --git a/youtube_dl/extractor/brightcove.py b/youtube_dl/extractor/brightcove.py
index ab62e54d63..14f9a14edf 100644
--- a/youtube_dl/extractor/brightcove.py
+++ b/youtube_dl/extractor/brightcove.py
@@ -572,7 +572,8 @@ def _parse_brightcove_metadata(self, json_data, video_id, headers={}):
             container = source.get('container')
             ext = mimetype2ext(source.get('type'))
             src = source.get('src')
-            if ext == 'ism' or container == 'WVM':
+            # https://support.brightcove.com/playback-api-video-fields-reference#key_systems_object
+            if ext == 'ism' or container == 'WVM' or source.get('key_systems'):
                 continue
             elif ext == 'm3u8' or container == 'M2TS':
                 if not src:
@@ -629,6 +630,14 @@ def build_format_id(kind):
                         'format_id': build_format_id('rtmp'),
                     })
                 formats.append(f)
+        if not formats:
+            # for sonyliv.com DRM protected videos
+            s3_source_url = json_data.get('custom_fields', {}).get('s3sourceurl')
+            if s3_source_url:
+                formats.append({
+                    'url': s3_source_url,
+                    'format_id': 'source',
+                })
 
         errors = json_data.get('errors')
         if not formats and errors: