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The "XfinityTV Online Help FAQ" at http://forums.comcast.com/t5/XfinityTV-Website/XfinityTV-Online-Help-FAQ/m-p/1106967#U1106967 includes this:
Can I watch videos on xfinitytv.com if I am outside the USA?
Unfortunately, we do not have the rights to stream content internationally. If you are physically located outside of the United States, you will be unable to watch videos on our site.
I would imagine the same restriction applies to apps.