IANAL. First of all a cease and desist doesn't require you to do anything. It's merely a threat. That said it seems pretty clear that you're violating copyright laws. The DMCA only applies to user generated content (UGC). You're not letting users input their own links to 3rd party content, you're finding the links yourself. It doesn't matter where you get them from. Not only that but you're not linking to this content on other sites, you're actively playing it for users within your app.
It's very cool you built this in HS. Let the whole thing be a good lesson in building apps and dealing with the law.
It's very cool you built this in HS. Let the whole thing be a good lesson in building apps and dealing with the law.