Can i download Halo Reach off of the internet to burn to a disc? (Not to steal, but to download to my HD)?

I have a Halo Reach disc that was damaged from the console, but i will be able to use it if its downloaded to my xbox 360's hard drive. I might be able to download it from a friends Reach Disc, but I'm curious if I can just download it off of the internet to burn to a disc. So i can download it to my hard drive, and then i can use my Reach Disc to play it on my xbox again.