so I'm creating karaoke website for client, and I need to secure videos from beign downloaded. So for example he is able to put in flash videos, how can I make sure noone can download them, cause it will be internet shop, where people will be able to buy the song and play it for like 1 hour, after that it won't be able, but the issue is that if they will buy it for one hour, they will be able to download it and play it as long as they want. You got any suggestions?
This is a waste of time: anything that reaches the users machine can be captured and saved.
Your client will not understand this, of course, so you may have to demonstrate using a program like Total Recorder.