The animal liberation front in Australia uses a big octocopter to gather information and evidence on the treatment of animals in farms, to be passed to authorities. The operation of drones on private land appears to be fully lawful.

Here the story and the video:

http://www.youtube.com/watch?v=kAXX1VxW3iQ

Update 7/1/2014

Looks like the Animal Liberation Front  has many “supporters”. Here’s what the youtube page shows now.

“The account was terminated due to multiple third-party notifications of copyright infringement”