Subject: Re: dumb GPL question
From: Werner Koch <wk@gnupg.org>
Date: 05 Jun 2001 22:39:46 +0200

 || On 05 Jun 2001 13:00:51 -0700
 || Ian Lance Taylor <ian@airs.com> wrote: 

 ilt> requirement to any license which doesn't already have it.  You can
 ilt> easily modify the GPL to force acknowledgement, by adding a condition

No need for that:

A copyright notice can't be removed, so the author/copyright holder
gets his credit. Furthermore section 2a of the GPL states:

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.

This is all for source files.  But a program is also required to do
this (section 2c):

    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    [...]

Well, there is no requirement to put this into documentation or
advertisements (like the old BSD license had). If this is a need, I'd
suggest to use the GNU Free Documentation License for this, which is
designed to allow for such requirements.

Ciao,

  Werner

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Werner Koch        Omnis enim res, quae dando non deficit, dum habetur
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