How can I find download links for vimeo videos?

I saw that today vimeo changed the way they are streaming the videos and I can't stream their videos anymore. I saw that when I generate the link to the video, which was for example:

http://vimeo.com/moogaloop/play/clip:6649390/1eab2a25f30f1aadaf5e306d0f40fd6c/1292498602/?q=hd

It's redirecting me to a page saying "Permission denied". I tried using curl, but without any success. I sniffed the traffic and I saw that it's streaming from something like:

http://av.vimeo.com/02047/623/34209065.mp4?token=1292496582_34de09a6d13212cf26af08357d311c30

Does anybody know how to get the working URL to the video file?

The way I'm getting the videos at the moment is:

1. Choose link http://vimeo.com/video_id.
2. Get only the video_id.
3. Get the XML for the video http://vimeo.com/moogaloop/load/clip:video_id;.

4. parse the XML and find the necessary information:

   • request_signature
   • request_signature_expires
   • isHD

5. Generate the link:

   $video_link = "http://vimeo.com/moogaloop/play/clip:".$video_id."/".$request_signature."/".$request_signature_expires."/?q=".$quality."";
   

If I do this manually through the browser it works, but if I do it through the script it doesn't.