Ask HN: Gateway to P2P

I'm thinking about creating an internet-facing website that does the following: -You put what you want to find in the search box and give the site an email address -Website gives page telling user to get a cuppa and check their email soon. -Server goes to find it, download it and zip it server side -Server emails user with a HTTP download link/stream on the server

This is primarily for me, I prefer to get Linux distributions and royalty free music from P2P but my ISP traffic shapes, so HTTP downloads and streams are better for me. The question I have, is whether I would be held liable should someone do something nefarious? Is this a gray area or is it something they would come down on me hard and fast for, for providing a simple service?