Agreed, this description makes no sense. If you're talking about a point & shoot camera, or any camera with a live preview where the CCD is continually exposed

Agreed, this description makes no sense. If you're talking about a point & shoot camera, or any camera with a live preview where the CCD is continually exposed, then it might work. But a plain old SLR is going to expose its CCD for maybe 1/1000 of a second on a sunny day. I have seen a system like this that worked by detecting flash photography, and firing a flash back at the source of the original flash. If you react quickly enough to a flash, you can blind the CCD while it's still exposed, ruining the image. Can't find the link right now. But if you don't use a flash, then that system doesn't work.