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That is the copyright notice in the source code. You also can look up in the copyright.php the details of the copyright. That also cannot be removed. You do not have to have footer or meta information, or any other visible mention of Joomla! but you cannot remove the copyright notices in the source code or copyright.php.
OK, we can call this a "clear" answer.
(never had doubt about this: "a clear answer is possible"..

)
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I also think that have to keep the copyright.php intact with the Joomla! files.
Does that answer your question?
Partially..

I think you have to keep the copyright.php content intact, but adding infos is permitted.
We can see in copyright.php the old Mambo copyright:
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Mambo
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Copyright: 2000 - 2004 Miro International Pty Ltd
License: GNU General Public License (GPL)
So, someone can make (or not) some little modifications, adding his copyright as above and (legally) putting some like this in metatags:
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me@mycms.com" />
...which is not requested but can make sense to Mr. "someone"..

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Just a note.. this issue is brought up every now and then, (see the general discussion forum). I don't understand why it is brought up unless it is brought up in the context of one's own site, but for some reason that almost never seems to be the case.. it is brought up in the context of someone else site.
Nothing strange, I think.
Questions cames up when you take a look at the universe as it is.. or speculating about abstract theories.
I'm not that kind of scientist.. I only look around and questions cames up.
Try to figure out how can I have questions about Joomla if Joomla don't exist..
Same.. if I never think about changing copyrights I need someone who does it, for having some questions to ask.
In most case, in the whole human activity, you need a previous issue to start your interest... don't you think?

If your question is a simple "why?" I can answer saying that we all are different, ones feels good with poor informations (or the "right" amount of that) and others wants to catch the fox.
The same in music. Most people feels confortable playing the same 5/6 chords for life.. (and maybe building a career around 3 or 4 progressions or less..) others wants to studying orchestration, sound engineering, new techniques and harmonic rules..
I'm just trying to deeply understand that rules because (as musician first) copyright issues are for me a great argument of interest.
Thank You!
Max
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"Civiltà è la misura con cui la comunità provvede a tutti, nel disinteresse collettivo. Il disinteresse è la norma di selezione per l’immortalità di una razza intelligente."
http://www.ufomachine.org/