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Re: ARC patent

From: Neil Conway <neilc(at)samurai(dot)com>
To: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Cc: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>,Jan Wieck <JanWieck(at)Yahoo(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: ARC patent
Date: 2005-01-17 22:55:50
Message-ID: 1106002550.22946.83.camel@localhost.localdomain (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Mon, 2005-01-17 at 12:15 -0800, Joshua D. Drake wrote:
> We have just admitted that we knowingly may infringe upon
> an IBM patent. That really is a different thing than,
> "We have some really smart people that came up with something,
> "like" this other technology".

The code is clear that it implements the "Adaptive Replacement Cache",
which is an algorithm proposed by IBM; the code probably references some
IBM papers on the topic -- and if not, discussions of ARC on -hackers
certainly do. I don't see how there could be any reasonable grounds for
arguing that, prior to this thread, we just "came up with something
really, really similar".


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