How to implement a secure video streaming website? I want to create a secure Video streaming website where people need to pay to play videos and they should not be able to download directly the video.
What are the possible solution to achieve this? I know there is a flowplayer secure streaming plugin http://flowplayer.org/plugins/streaming/secure.html but is this enough?

Thanks
This is quite a complicated problem with a lot of possible approaches; a whole book could be written about it (your question is probably too broad).

That said, have you checked out Videola?  Videola is a Drupal-based distribution for creating subscription-based websites.  It's made by Lullabot, one of the leading Drupal companies, and they use it to power their learning network, Drupalize.me.