Granted I don't know a whole lot about Cyphers, but what I do know is that the code that they put in the video isn't actually in the video, you can see it in the source code. In other words it's not like they are rendering a secret code for each video stream, they are using HTML, PHP, or Java to implant a watermark over the stream. What that means is that they can't decipher some secret message by using a screen shot or video, as they aren't actually doing anything to the video, they are just putting up a watermark. It would be like writing your name on a piece of transparent paper, holding it over a live broadcast show, and then filming it. Yes, your name would show up, but only on that particular recording that you filmed.