From 924d479fd8fda945634356c1fff512af94120623 Mon Sep 17 00:00:00 2001
From: Davinder Singh <davsinghm@gmail.com>
Date: Sun, 20 Jan 2019 01:47:29 +0000
Subject: [PATCH] [youtube] fix 403 forbidden error

youtube has new 'sp' paramter in url_data which gives signature param name that
server is expecting for the signature param value in url
---
 youtube_dl/extractor/youtube.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index c8bf98b58..e52547f5b 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1886,7 +1886,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
                     signature = self._decrypt_signature(
                         encrypted_sig, video_id, player_url, age_gate)
-                    url += '&signature=' + signature
+                    if 'sp' in url_data:
+                        url += '&' + url_data['sp'][0] + '=' + signature
+                    else:
+                        url += '&signature=' + signature
                 if 'ratebypass' not in url:
                     url += '&ratebypass=yes'