Protect streamed files from being downloaded

[Thomas]

Hi Marcos, that's exactly what I meant. I would like in the future to
stream video and music that has copyright on it, and to do that
legally I will have to negotiate with the music/video companies and it
is compulsory that the content cannot be simply downloaded by typing
the url in a browser or using wget, this is an absolute requirement.
Not everybody knows how to dump or screencast what is going on the
screen/audio card or even copy the cache content.

I am already limiting the rate of the transfer, but that's more to
save the bandwidth than to protect.