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Message-ID: <3A900513.9467F293@ece.gatech.edu>
Date: Sun, 18 Feb 2001 12:23:31 -0500
From: "Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>
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To: DJ Delorie <dj AT delorie DOT com>
CC: robert DOT collins AT itdomain DOT com DOT au, cygwin-apps AT cygwin DOT com
Subject: Re: Wipe out older versions in cygwin/latest, cygwin/contrib
References: <20010217002929 DOT A31035 AT redhat DOT com> <00a501c098a4$885898a0$0200a8c0 AT lifelesswks> <200102181653 DOT LAA05541 AT envy DOT delorie DOT com>
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DJ Delorie wrote:
> 
> > Other than any GPL requirements.
> 
> There are *no* GPL requirements to keep old versions around.  Even the
> FSF doesn't keep old versions around.

When I read this, I went "huh? What about the three-year requirement?" 
So I went back and re-read the GPL.  In case anyone was wondering, it
looks like (IANAL) you only have to keep the source code around for
three years if-and-only-if you initially distributed the binaries
*without* source availability via the same method.  Your compliance with
the GPL in that case is predicated on sending a *written* offer with the
binary that says "Get the sources using such-and-so method".  It is that
*written* offer which must be valid for three years.

If you distribute the sources and the binaries at the same time (e.g. as
is done within cygwin/latest and cygwin/contrib) then you can yank the
sources whenever you yank the binaries.

--Chuck