Apparently women walk around naked at the Burning Man Festival, held annually in the Nevada desert.  Someone filmed some naked women there in order to sell a video.  Now the organizers of the festival are suing the video’s producers under, among other theories, invasion of privacy.  It’s interesting that someone can walk around naked in the desert and have an expectation of privacy, but given that the festival was likely on private property and that admission was pursuant to license (otherwise known as a ticket), then I suppose such an expectation is plausible.