[THIN] Flash Video - Limiting there of

We limited the use of Windows Media Player on our farm as there was no
workplace justification for it and did not want memory/cpu/bandwidth
wasted on it.  
 
Now, folks are going to http://video.google.com and watching video with
the installed Macromedia Player.  We recently realized the ability of
the flash component to play video.
 
How do you prevent this?

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