The article mentions that only cameras in range of the device would be affected. What happens if I use one of the digital cameras with the 10x zoom to take a picture from outside the privacy range?

Does this affect ALL cameras in range, or only cameras pointed at the person wanting privacy? If it affects all cameras, how do I prevent the paranoid person behind me from spoiling my family pictures at Disneyland? If it only affects cameras pointed at the person with the privacy device, how does the camera know who has the device, or which way it is pointing?

As has also been pointed out, there's also the problem of criminals (in uniform or otherwise) using such a device to block the collection of photographic evidence. If a device like this does become mandated for all digital cameras, I can see a booming business selling privacy devices to those wanting to get past security cameras.