Just keep doing what you're doing, in the UK, try not to open yourself up to US jurisdiction if you don't have to. Keep assets out of there. If you really are

Just keep doing what you're doing, in the UK, try not to open yourself up to US jurisdiction if you don't have to. Keep assets out of there. If you really are infringing and concerned, I'd see about proactively getting favorable licenses while you're tiny, in case you get big. If you aren't infringing and it's a bunch of crap, like the Hipmunk case, I'd do what they did. Seek a declaratory judgment and call their bluff. After all, the troll might not even have money to fund a real battle. If their lawyers are working on contingency (they often are), they won't waste their money pursuing something with no real shot.