Ways to download copyrighted Youtube videos in MP4a?

Got this error

WARNING: The url doesn't specify the protocol, trying with http [generic] watch?v=hmc55y0UkR0: Requesting header WARNING: Could not send HEAD request to http://'https://www.youtube.com/watch?v=hmc55y0UkR0: <urlopen error [Errno 11001] getaddrinfo failed> [generic] watch?v=hmc55y0UkR0: Downloading webpage ERROR: Unable to download webpage: <urlopen error [Errno 11001] getaddrinfo failed> (caused by URLError(gaierror(11001, 'getaddrinfo failed'),)) 'index' is not recognized as an internal or external command, operable program or batch file. 'list' is not recognized as an internal or external command, operable program or batch file.

Sorry to keep bugging you on this, but do you know what this means?

/r/Piracy Thread Parent