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To: Garrett Wollman <wollman@halloran-eldar.lcs.mit.edu>
cc: Bill Trost <trost@cloud.rain.com>, security@freebsd.org
Subject: Re: secure/ changes... 
In-reply-to: Your message of "Wed, 26 Jul 1995 18:57:00 +0200."
             <9507261657.AA08451@halloran-eldar.lcs.mit.edu> 
Date: Fri, 28 Jul 1995 01:18:13 +0200
From: "Julian Stacey <jhs@freebsd.org>" <jhs@vector.eikon.e-technik.tu-muenchen.de>
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> And public-key cryptography in general is also covered by a patent,
> which expires this year or next. 

FWIW
I know that patents granted by the European Patent Office can be extended,
(subject to conditions).
I don't know about USA patents, but they may be extendable too.
Julian S