The RIAA forced me to shut down a successful website/apps I built in high school
There are two major components to DMCA safe-harbor compliance. The first is that you honor takedown requests; unfortunately for software entrepreneurs, this seems to be the only DMCA component that is widely understood.<p>The second major component is that you not operate your service with direct knowledge of infringement. A simple way to illustrate this is that if you have a screenshot of your application being used to play Madonna tracks, you are obligated to hunt down those tracks and remove them yourself. If it can be shown that you purposefully don't do that, you can end up forfeiting safe-harbor.<p>You are probably happier in the long run for shutting this project down. While you clearly want to believe that you aren't infringing copyright, which is an admirable sentiment, you obviously aren't taking advantage of "fair use" by giving your users direct access to copyrighted music under your own branding.