I have been suffering from SAD for the last almost 30 years and I have tried all treatments that were offered, from psychotherapy to drugs and light therapy. This autumn I have been trying out Valkee. For the first time in all these years I am SAD-free. I will have to wait till the end of the SAD season to conclude whether Valkee works for me or not, but it looks very promising. Regarding the patent issue I wonder how you can patent such a simple device that does not seem to involve any technical novelty.