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[[license text="""
Copyright © 2007 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the
terms of the GNU Free Documentation License, Version 1.2 or any later version
published by the Free Software Foundation; with no Invariant Sections, no
Front-Cover Texts, and no Back-Cover Texts.  A copy of the license is included
in the section entitled [[GNU_Free_Documentation_License|/fdl.txt]].
"""]]

A principal is an accountable entity.  A principal may be
a user.  On some computer systems, users are represented by their
respective UID.  A process may also be a principal.  However, a
principal may span multiple processes (a web request that causes
a CGI script to be invoked) or a principal may contain a number
of separate principals (a web server serves multiple requests,
each request represents a different principal).