UnavailableVideoError: HTTP Error 403: Forbidden

[Nono-m0le]

# youtube-dl -v http://www.youtube.com/watch?v=6NXnxTNIWkc
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', 'http://www.youtube.com/watch?v=6NXnxTNIWkc']
[debug] youtube-dl version 2013.08.17
[debug] Python version 2.7.3 - Linux-3.2.0-4-amd64-x86_64-with-debian-7.1
[debug] Proxy map: {}
[youtube] Setting language
[youtube] 6NXnxTNIWkc: Downloading video webpage
[youtube] 6NXnxTNIWkc: Downloading video info webpage
[youtube] 6NXnxTNIWkc: Extracting video information
[youtube] 6NXnxTNIWkc: Encrypted signatures detected.
[youtube] encrypted signature length 82 (40.41), itag 44, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 35, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 43, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 34, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 18, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 5, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 36, html5 player vflGNjMhJ
[youtube] encrypted signature length 82 (40.41), itag 17, html5 player vflGNjMhJ
ERROR: unable to download video
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 573, in download
    videos = self.extract_info(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 327, in extract_info
    return self.process_ie_result(ie_result, download=download)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 410, in process_ie_result
    for r in ie_result['entries']
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 357, in process_ie_result
    self.process_info(ie_result)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 550, in process_info
    raise UnavailableVideoError(err)
UnavailableVideoError: HTTP Error 403: Forbidden

[phihag]

Your installation of youtube-dl is predates the latest YouTube interface change. Type sudo youtube-dl -U to update to 2013.09.16 or newer.

[Nono-m0le]

Sorry about that !