Made me think of that Silicon Valley episode with the Patent Troll.

I don't remember it exactly, but I think near the end Richard solves the situation by building a (fake?) music app that detected that the song that had made the Patent Troll rich was actually a ripoff from another song that Richard had acquired the rights to, so now Richard could technically sue the Patent Troll for all the money he had made...

If anybody has a link to that scene it would be great.