I was a bit disappointed to see the use of a personal force field on the Emperor in the second episode. In the books personal force fields are not technologies that the Empire possesses and only latter was the foundation able to create them.
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I also assume it is a technology owned only by Emperors, or it would disappear by de decline of the Empire, such as other technologies.
I felt the same way when I saw it but I'm willing to bet it's just the Emperor's that have them. Where as anyone (at least the super important people) could in the Foundation. But we'll see.