https://sites.google.com/site/bypassCE is going to post an answer to your question on 14 February 2011 it seems. Bookmark it and keep your eye out for it!
What you want to do is find a proxy that has the youtube source code into a proxy just google for one. If your filtering system has a block on proxifiers your out of luck
You should not, the filter is there for a reason and if you attempt to bypass it you will most likely be violating policy which could lead to negative action being taken against you.