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The point would be to permanently encrypt the file so it could only be read with readers sporting the same encryption code (which is why SSN was suggested... it's yours and yours alone). Someone else's reader, with their code based on their SSN (or whatever), wouldn't be able to read it. But every device you owned would.
It wouldn't restrict a file to 1 device. But it would restrict the file to 1 user. This might satisfy publishers looking for a rampant sharing solution.
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