Path: utzoo!news-server.csri.toronto.edu!torsqnt!hybrid!scifi!bywater!uunet!mcrware!jejones
From: jejones@mcrware.UUCP (James Jones)
Newsgroups: comp.misc
Subject: XOR cursor (was Re: AT&T owns X-windows ??  (was Re: Software Pat))
Message-ID: <5388@mcrware.UUCP>
Date: 15 Mar 91 15:18:46 GMT
References: <1991Mar1.184945.6946@mtxinu.COM> <996@caslon.cs.arizona.edu> <685@newave.UUCP> <6497@auspex.auspex.com> <693@newave.UUCP> <118831@philabs.Philips.Com>
Reply-To: jejones@mcrware.UUCP (James Jones)
Organization: Microware Systems Corp., Des Moines, Iowa
Lines: 9

In article <118831@philabs.Philips.Com> aeb@briar.philips.com.UUCP (Anne Barschall) writes:
>You can bet that no one was able to prove that the technique was used before
>Cadtrak applied for a patent, otherwise the patent would NOT have stood up in
>court.

The fact that X exclusive or X = 0 is the basis of the Vernam cipher, which
has been in wide use since the 1930s.

	James Jones