YouTube Video Download Link form HTML Source Code?

I am interested in generating a download link of a YouTube video (some thing like what you get from a site like KEEPVID) for a project that I am involved in. I believe that the link should be able to be derived from HTML code of the web page. If so how can I get it done prgramically or analytically. If the... show more I am interested in generating a download link of a YouTube video (some thing like what you get from a site like KEEPVID) for a project that I am involved in.

I believe that the link should be able to be derived from HTML code of the web page. If so how can I get it done prgramically or analytically.

If the method of getting the link is not from the page source how else?
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