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Wouldn't the file still be found in the users temp files...
What you could do for html5 is:
Predefine on the HTML or dynamically insert a <canvas> to the DOM. This is the "player" that the user sees.
Dynamically create a video tag via JS, append it to the DOM hidden and give it a url to stream. This will be the video source for the canvas.
Then with JS, you periodically grab data from the <video> you just created and draw it to the <canvas>. With this step, the video gets fed to the canvas.
That's the very basic of the entire routine. Since your player is now the canvas and the true video hidden, you can try right-clicking all you want and save. Since the canvas acts like an image on the page, you can only save a shot of a frame that was displayed on the canvas. As for controls, JS has an API for controlling <video> so you can create custom buttons and sliders.
However, if they know you are doing this, they will find your hidden video element..
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