It's not that obvious. iOS is pretty secure, if they keep the social network and cameo feature limited to that there might not be good ways to export videos off the platform onto others beyond pointing a camera at the tablet screen. And beyond there being lots of ways to watermark stuff to be detectable, nothing stops the device using its own camera to try and spot if it's being recorded. The bar can be raised quite high as long as you're willing to exclude any device that isn't an iPhone/iPad.