Consider copyright videos as not available in order to continue on error

lib/youtube-dl.js

@@ -28,7 +28,13 @@ var isDebug = /^\[debug\] /;
 var isWarning = /^WARNING: /;
 var isYouTubeRegex = /^(https?:\/\/)?(www\.)?(youtube\.com|youtu\.be)\//;
 var isNoSubsRegex = /WARNING: video doesn't have subtitles|no closed captions found/;
-var videoNotAvailable = /This video is not available|This video has been removed by the user|Please sign in to view this video|This video is no longer available/;
+var videoNotAvailable = new RegExp(
+ 'This video is not available|'+
+ 'This video has been removed by the user|'+
+ 'Please sign in to view this video|'+
+ 'This video is no longer available|'+
+ 'This video contains content from'
+);
 var subsRegex = /--write-sub|--write-srt|--srt-lang|--all-subs/;
 
 /**
@@ -417,4 +423,4 @@ ytdl.getExtractors = function getExtractors(descriptions, options, callback) {
 
  var args = descriptions ? ['--extractor-descriptions'] : ['--list-extractors'];
  call(null, args, null, options, callback);
-};
+};