*If* the camera could actually see in your windows (which during the daytime is unlikely). And *if* someone put a telephoto lens on the drone instead of the wide-FOV cameras normally used. And *if* the camera could record something that would be impossible if the drone was hovering over an area outside your property...*then* I would say you would have a case. Or if someone is doing it for commercial purposes rather than personal/recreational ones. Consider that an artist put on a public exhibition of relatively close-up photos taken of people through their exterior windows, without their permission using a long telephoto lens. When he was sued by the subjects of his photos for invasion of privacy, the plaintiffs lost and the photographer won. Privacy ain't what it used to be. The FAA says it''s legal to fly a drone over your house for non-commercial purposes. Let us know when you file your lawsuit.