SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

[llper]

While trying on my qnap I get:
[~/tempmusic] # python3.2 /usr/local/bin/youtube-dl "https://www.youtube.com/playlist?list=PLivuODczBfTmwqBSyVJUCjFYVmxWVqszB" -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['https://www.youtube.com/playlist?list=PLivuODczBfTmwqBSyVJUCjFYVmxWVqszB', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.02.18.1
[debug] Python version 3.2.3 - Linux-3.4.6-x86_64-with-glibc2.0
[debug] exe versions: ffmpeg 0.8.10
[debug] Proxy map: {}
[youtube:playlist] PLivuODczBfTmwqBSyVJUCjFYVmxWVqszB: Downloading webpage
ERROR: Unable to download webpage: <urlopen error [Errno 1] _ssl.c:392: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed> (caused by URLError(SSLError(1, '_ssl.c:392: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed'),))
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 308, in _request_webpage
return self._downloader.urlopen(url_or_request)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1600, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/opt/lib/python3.2/urllib/request.py", line 368, in open
response = self._open(req, data)
File "/opt/lib/python3.2/urllib/request.py", line 386, in _open
'_open', req)
File "/opt/lib/python3.2/urllib/request.py", line 347, in _call_chain
result = func(_args)
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 671, in https_open
req, *_kwargs)
File "/opt/lib/python3.2/urllib/request.py", line 1137, in do_open
raise URLError(err)

Can you advice how to work around this issue?

Regards,
D