SUID Patent (was RE: SCO: "thread creation is about a thousand ti mes faster than on)

From: Marty Fouts (
Date: Tue Aug 29 2000 - 02:36:04 EST

Unfortunately, you are incorrect. DMR did receive a US Patent (Patent
#4135240) on the SUID bit. There is at least on text on Unix security that
contains a copy of the patent in an appendix.

(see, among other sources, Peter Salus'

You can view the actual patent in the IBM patent database, by the way:

Speaking of Salus, I believe it was Peter who coined "the difference between
theory and practice is always larger in practice."


-----Original Message-----
From: Alexander Viro []
Sent: Tuesday, August 29, 2000 12:22 AM
To: Albert D. Cahalan
Cc: Alan Cox;; Horst von Brand; Mitchell Blank Jr;
Mark Kettenis;;
Subject: Re: SCO: "thread creation is about a thousand times faster than

On Tue, 29 Aug 2000, Albert D. Cahalan wrote:

> > Erm?
> > * setuid is a fscking wart - THE mistake of dmr and/or ken.
> If not urban legend, dmr was the patent owner.

Erm... That would be a nice way to bury one's mistake - patent it and
refuse to license ;-) Unfortunately, didn't happen...

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