amazon web services - Denying direct access to AWS S3 Object -

in web application scenario, html5 <video> tag used follows:

<video src="https://s3-us-west-2.amazonaws.com/mybucket/avideo.mp4">   <source type="video/mp4">     html5 video required </video> 

how can stop directly accessing video copy-pasting https://s3-us-west-2.amazonaws.com/mybucket/avideo.mp4 in browser url bar?

see example on this page regarding restricting access requests include specific http referrer.