I don't know if this helps you at all, or if you've solved your problem, but using HTML5, I prevent the user from downloading the video or any of the other "right-click" functions with this (oncontextmenu) :
<div id="video-container">
<video id="video1" autoplay poster="loading.jpg" preload="auto" oncontextmenu="return false;" >
<source src="videos\mikethefrog.mp4" type="video/mp4" />
<source src="videos\mikethefrog.webm" type="video/webm" />
<source src="videos\mikethefrog.ogv" type="video/ogg" />
</video>
</div>