A question about bandwidth
 

Alright so there is this cool software in which in seconds you can make someone view and download contnt on your computer!

so the ip/foldername/file

and what im planning to do is i have a script which can secure the file "link" and make it something like

mywebsite.com/index.php?downloadid=13

and stuff like that so they can't know where they are downloading it from..

If they download like that will the bandwidth go from my hosting account or no bandwidth will be apparantly used?

and is this legal? bby the way i am going to share cricket video files [cricket is a game like soccer,baseball etc[