Does he have ownership over ALL aperiodic tilings or just the ones he's come up with? Anyway, that's unfortunate. Can't he just get a cut or something? Also,

Does he have ownership over ALL aperiodic tilings or just the ones he's come up with? Anyway, that's unfortunate. Can't he just get a cut or something? Also, this all really begs the question as to whether this is an "invention" or just "math". Imagine if Newton's heirs had to get a cut every time Newtonian physics was used (or calculus for that matter... splitting it with Leibniz's heirs)