Restrict direct download of the video file

Hi,

I'm currently using Video module 6.x-4.x-dev with Zencoder and Amazon S3.

Is there any way to restrict direct download of video file? My users will be authenticated in order to see the video page but I wonder if there is any way to make the video more like streaming which is not downloadable?

If streaming (with streaming server) is the only option here, is there any good solution that works with Drupal?

Thanks,
--Nader