Its a pdf about plan9 authentication in linux by one Ashwin Ganti, sorry for the double post.

On Sun, Jul 3, 2011 at 3:38 PM, andrew zerger <rhoyerboat@gmail.com> wrote:
More info for people looking from the same vantage point as me..

This document is something I am about to read.. (I wasn't sure what a cap device in linux was, this was the most relevant google result.)

http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/en/us/pubs/archive/34433.pdf


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