asp.net - prevent users from downloading music -

I am writing a music website for my client using ASP.NET. Everything is cool, I do not know how to prevent users from downloading the song played. For example, I click on "Heal the World" to play and when the song is playing, I do not want the IDM download manager or other download program download dialog to appear

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Any help questions for me? I had used this code to play

  embed type = "app / x-empler 2" src = "files / funring / 15.mp3" align = "absbottom" />  

And I do not want to download follow-up image

The song is being played === the song is

downloading.

edit (a more useful answer)

If you describe it, it is a flash media server / 5 / Vowja, which distributes audio as RTMP (yes, there are programs that can download them) or Windows Media and its uncontrolled DRM (and limited audience). Effectively the FMS route that I will take, I was sending music to the browser and I needed a good mix of maximum reach against some levels, although it should know that if it can be heard at the end of the day, So can be copied.