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It's a restriction demanded by the media companies. They are afraid of people making illegal copies, so video is restricted to that particular device.
Thanks. So yes, a computer streaming (like an iPhone) when accessing XFinity saved content from a location other than at home, will likewise be restricted? The odd thing is that if anyone wants to copy the content when at home, no problem. Odd.
There are no restrictions on an external display when using the stream website, at home or away. There's no feedback to the website when an external display is connected.