Lol... did you actually bother to watch it? All they were doing was sniffing and jamming existing powerline communication protocols like X10 using an arduino. Your computer does not communicate over powerlines using X10, Zigbee, Homeplug, or any other standard powerline communication protocol without an external device connected to it to interpret those signals... a modem.
So, again... you proved my point.
Now, they did touch on a method that has been well known for a long time for penetration testing where you use powerline ethernet devices to get inside your corporate network. But again... you need a powerline modem on the inside... that requires you to get it inside the building... and that is just standard ethernet hacking at that point. You can sniff for traffic, attempt password hacks, known exploits... all standard hacking. None of this supports your claim that by simply plugging your computer to a power line, the NSA can spy on you.
Again, let me remind you. Didn't I say, it's NOT done this way. That it was only to give you a "taste of the possibilities." Read my damn comment, ass hole. Did I not say, that what they were showing was NOT how the government and/or corporations use the power line to record you and/or hack you? I'm quite certain I said that. But NO, you have to go and put words in my mouth like an ignorant ass and claim that's what I intended to convey when I said contrary to your very claim.
As for your "claim" of something "must" be done a certain way or "have" a certain thing to do something; your mind is weak and easily manipulated in regards to engineering and stuck inside of a box. I still find it hard to believe you're an engineer.
I'm not telling you shit cause you don't know shit. Your lack of knowledge of longitudinal and metallic current proves you don't know what you claim to know. Especially, in regards to "transmission." I actually already told you more than enough for you to figure it out on your own if you actually understood longitudinal current, metallic current and HOW they can be converted. But do they actually have to be converted? Can they not "bleed" over when they "naturally" convert; especially when encountering an unbalance or the transmission of a signal or harmonic is above a certain level (dB)? Hint Hint... LOL... But your head is so damn puffed up you can't get it out of your ass. Besides, your "not an engineer" ass is just too damn ignorant and honestly not worth my time.

Others on here can continue to think I'm wearing a tinfoil hat as well. Go ahead, be my guest. The truth is, all of you tin foil hat talkers are too damn ignorant to KNOW how ignorant you actually are. If you don't understand longitudinal and metallic currents and how longitudinal current can convert to metallic current OR be at a hot level and be heard while monitoring metallically; you simply won't understand. It's simply not worth my time and effort to be on here for a couple of days explaining noise mitigation, power influence (longitudinal current) and noise (metallic current). Why are those important? Because you have to understand the power line first before you can understand how it can be used in transmission of data. You have to also understand how those longitudinal and metallic currents (frequencies) can bleed over transformers into devices and from those devices back on the power line through the transformer.
I've actually said enough already. I'll let your so-called electrical engineer ignorant ass figure it out.