Clive being blocked by youtube???

[JD]

I have been getting this error for every youtube URL I pass to clive:

$ clive -f best 'http://www.youtube.com/watch?v=_SEULZIHru0'
Checking ...error: server response code 403 (conncode=0)
$ clive -f best 'http://www.youtube.com/watch?v=lAD6Obi7Cag'
Checking ...error: server response code 403 (conncode=0)
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.... etc.