is a simple HTTP stream, not RTMPE stream. Please note that some streams on YouTube really use RTMPE protocol.

It can be downloaded with many web-sites including
http://download-youtube-videos.org/getvideo.php

And it can be downloaded with Replay Media Catcher (free YouTube downloader) as well.

HTTP streams are cached by a web-browser, so you can copy them from the cache using software like Video History Tool of Replay Media Catcher. You can also clean the browser cache and record it with Replay Media Catcher or any other software.

Related threads:
RTMPE stream recording/downloading/capturing/ripping/saving
How to record rtmp:// flash video .flv stream from embedded Adobe Flash Player
Getting/Capturing/Downloading .FLV flash videos streamed through the HTTP protocol


YouTube video downloaders: How to Record/Capture/Download flash videos from YouTube
The best web-browser plug-in for downloading YouTube videos
YouTube: How to download YouTube videos without downloading and using any software?