I had a kid work for me back in the late 60's that became the head engineer at MXR who made all kind of neat little effects boxes for musicians and were very popular. He said every time one his devices became popular, the big companies like Roland would copy them. He said it was futile trying to stop them. I am an Apple fan and stock holder, but if they did just copy the patents, then they are no better. I use the heart rate app every day and I am sure there are plenty of other devices that read heart rates too, like sports devices the cyclists wear in the Tour d' France.