Sorry, I keep reading earlier in this thread and want to answer...
someone said they would not be happy with a 'drone' flying over their property. I think this is caused by a lot of the unfounded hysteria about them, as most do not fully know what they are talking about.
Here's a good link to show what I was talking about, that a telephoto lens on a good camera is much more 'dangerous' (if it wanted to be) than any drone could ever be:
(NOTE: Don't look at the cover photo on the article, an average drone that most of us can afford and the type we are discussing in this thread can't carry a camera and lens this big!!! The cover photo was only to catch your visual attention)
http://petapixel.com/2015/08/21/are-...creep-you-out/
Could a drone fly lower over your property? Of course it could, but you would be VERY aware of it, they sound like 10,000 swarming bees, there is no way you would not notice it. If you can't hear it, then it's probably not close enough to worry about.
Fell free to be paranoid about these flying toys.... but 99.99999999% of the people flying them are nice, follow the rules, and have no interest in trying to 'peek' into your private life. The next time you see someone flying one, walk up and ask the person some questions about it. I'm sure they would love to tell you all about it (But please wait until they land to start asking questions).