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[Hilos de Discusión] [Fecha] [Tema] [Autor]Me encontré con este articulito en el Linux Today (www.linuxtoday.com), en
el que ponen en entredicho la legalidad de que KDE se rija por la licencia
GPL...
Debian's stance on KDE.
Oct 8th, 12:09:16
There has been much controversy about the various licence conditions under
which KDE[1] and Troll Tech[2]'s Qt library are
distributed, and about the relationship between these two licences.
This document attempts to focus on the aspects of this situation that have
resulted in Debian[3]'s decision to cease distribution of KDE
binaries via Debian Internet sites and official CD-ROMs.
It should be noted that this action has not been taken out of any
antagonism towards non-free[4] software, or KDE, but purely on the
basis that the various licences combine in a way that fails to grant
Debian (or anyone else) the right to distribute these binaries.
The Problem:
------------
1) Troll Tech's Qt library is distributed under a licence[5] that includes
this condition:
You may copy this version of the Qt Free Edition provided that the entire
archive is distributed unchanged and as a whole, including this
notice.
2) The KDE code is licensed under the GNU GPL v2[6]
3) Currently, KDE must be linked against Qt in order to produce usable
binaries.
Clause 2.b. of the GPL reads:
You must cause any work that you distribute or publish, that in whole
or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
The corollary of this is that if you link the GPLed KDE code against Troll
Tech's Qt library, and distribute it, you must distribute it
under the GPL.
However, the GPL insists that you grant the right to modify the complete
source of a program distributed under its terms, which is
clearly in conflict with Qt's licence conditions.
Clause 7 of the GPL reads:
7. If ... for any other reason ... conditions are imposed on you ...
that contradict the conditions of this License, they do not excuse
you from the conditions of this License. If you cannot distribute so
as to satisfy simultaneously your obligations under this License
and any other pertinent obligations, then as a consequence you may
not distribute the Program at all.
So, we have been denied the right to ``distribute the Program at all''.
Potential Solutions:
--------------------
1) Licence change
Since it is the choice of licence that has given us this problem, one
possible solution is to change the licence. It is perfectly possible to
distribute a program under a licence that reads something like:
``This program is distributed under the GNU GPL v2, with the additional
permission that it may be linked against Troll Tech's Qt
library, and distributed, without the GPL applying to Qt''
This would allow Debian (and everyone else) to distribute KDE binaries,
and it appears to reflect the KDE developers' actual intentions.
Who can make this happen ?
The only person that can change the licence conditions under which a
program is distributed, is the copyright holder (i.e. the author in
most cases).
In the case of programs that were written entirely by KDE core developers,
there should really be little difficulty in agreeing to choose an
alternative licence under which the binaries can be distributed.
Difficulties are likely to arise when either, significant portions of the
code have been contributed by the wider community, or when third
party GPLed code has been ported to Qt. This is not surprising, since the
GPL was explicitly designed to prevent GPLed code being
incorporated into non-free software.
2) KDE losing its dependence upon non-free software.
There are a few scenarios that could lead to this, the most promising one
being the Harmony[7] project (an attempt to implement a
GPLed replacement for Qt).
If any of these come to pass, then KDE binaries built without any
dependence upon non-free code should be possible, and would then
be included as part of the main Debian GNU/Linux distribution.
Of course, for this to happen the KDE developers will have to restrain
themselves from using any other non-free libraries. Also, limiting
themselves to using only those features (soon to be) available in Harmony
would obviously help.
So what IS allowed ?
--------------------
For code that is 100% authored by KDE core developers, they can flout
their own licence and distribute KDE binaries as they feel fit[8].
For operating systems that supply Qt as a default component[9] there is an
exception in the GPL, which would allow them to distribute
KDE binaries, linked against Qt.
Of course, the source can be freely published, since there is no problem
until it is combined with the Qt libraries, and their conflicting
licence.
So what is NOT allowed ?
---------------------
The taking of GPL code (by people other than the copyright holder),
linking it against code with an incompatible licence, and distributing
the resulting binary is explicitly prohibited[10].
In practice, most GPLed programs include patches submitted by many
authors. This means that it becomes impossible for any single
person to claim that they are the sole copyright holder, and can thus
issue the code under alternative licence conditions.
It should be noted that some of the KDE binaries have significant amounts
of third party GPLed code for which consent to link against
Qt and distribute has not been sought or granted.
Conclusion:
-----------
1) People should choose licences that reflect their wishes.
The KDE developers do not wish to impose all of the restrictions embodied
in the GPL, so they should not use the GPL.
2) People should respect the licence conditions under which software is
distributed.
For Debian, this means that as it stands, we will respect KDE's choice of
the GPL, by not distributing their binaries (as requested in the
GPL)
For KDE, this means that they should respect others' use of the GPL and
obtain permission to link that code with non-free libraries
before distributing the resulting binaries.
References:
-----------
[1] http://www.kde.org
[2] http://www.troll.no/
[3] http://www.debian.org/
[4] http://www.debian.org/social_contract#guidelines
[5] http://www.troll.no/free-license.html
[6] http://www.gnu.org/copyleft/gpl.html
[7] http://harmony.ruhr.de/
[8] Stephan Kulow, who is both a Debian maintainer and a KDE developer,
has declared his intention to continue producing Debian
packages which will be distributed from the KDE site.
ftp://ftp.kde.org/pub/kde/stable/latest/distribution/deb/
[9] It is not clear that there are any such OSs, but this is a bone of
contention. In any event Debian GNU/Linux does not include it, since
it does not comply with the the Debian Free Software Guidelines [4].
[10] A possible exception is the distribution of KDE binaries for an
operating system that includes Qt as a default component. Debian
GNU/Linux is certainly not such a system, and many people (RMS included)
would say that Linux as a whole is not.
Note: RedHat have come to a related conclusion, that may also be of
interest: http://www.redhat.com/redhat/qtlicense.html
"Qt" is a trademark of Troll Tech AS.
You may find answers to questions arising from this document here:
http://www.uk.debian.org/~phil/KDE-FAQ.html
Copyright (C)1998 Philip Hands. You may redistribute this statement
according to the terms of the GNU General Public Licence,
version 2 (Note that of course you must prominently mark any modified
versions).
+----------------------------------+ There are two major products
| Gunnar Wolf gwolf en chmd edu mx | to come out of Berkeley:
| Colegio Hebreo Maguen David | LSD and UNIX.
| Desde la ciudad de Mexico | We don't believe this
+----------------------------------+ to be a coincidence.