Thanks. I especially liked this part which talks about hotels and switching the MAC on your PC in order to authenticate Chromecast onto the hotel WiFi network. http://www.anandtech.com/show/7186/g...-hdmi-dongle/3

I also searched around for some PCAP packet captures to see what the packets look like from Chromecast and what packets, if any, are encrypted. I figured that if this is completely un-encrypted on an open WiFi network, then your next door neighbor hackling could push out content onto your TV. And sure enough I found this article. http://arstechnica.com/gadgets/2013/...-to-hijacking/