Linkbucks and shorte.st has a lot of API downtime, so I give you more URL shortener alternatives.
Watch the video tutorial! YtConv is free YouTube to MP3, MP4, 3GP and AVI (DivX) Converter and allows you
convert and download a YouTube Video to MP3, MP4, 3GP, FLV and AVI (DivX) file online. So you
are able to watch/listen to your favorite YouTube tracks.
Please report if you encounter any Youtube video that can't be converted/downloaded. It might be not because copyright protection but YtConv error.
Don't forget to always use anti virus for your PC especially when browsing YtConv.net. There are some good free anti virus outthere, such as Avast Antivirus