WANT TO DENY/BLOCK DOWNLOADING OF ONLINE VIDEOS/MOVIES

HI,
I AM HAVING A PROBLEM IN ISA SERVER 2006. I WANT TO DENY THE USERS FOR WATCHING THE ONLINE MOVIES OVER THE INTERNET AND ALSO CANNOT BE ABLE TO DOWNLOAD FILES WHICH ARE MORE THAN 10 MB.
( WITHOUT ANY SOFTWARE LIKE BANDWIDTH SPLITTER ETC ETC )
REPLY WILL BE APPRECIATED.