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<nowiki>GNU GENERAL PUBLIC LICENSE<br />
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{{review}}
Version 2, June 1991<br />
+
  
Copyright (C) 1989, 1991 Free Software Foundation, Inc.<br />
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The GNU General Public License V2 is a 'copyleft' license designed to protect the rights of users whilst still providing protection to the author of the software. It is intended to ensure the following rights for users
59 Temple Place, Suite 330, Boston, MA  02111-1307  USA<br />
+
Everyone is permitted to copy and distribute verbatim copies<br />
+
of this license document, but changing it is not allowed.<br />
+
<br />
+
Preamble<br />
+
<br />
+
  The licenses for most software are designed to take away your<br />
+
freedom to share and change it.  By contrast, the GNU General Public<br />
+
License is intended to guarantee your freedom to share and change free<br />
+
software--to make sure the software is free for all its users.  This<br />
+
General Public License applies to most of the Free Software<br />
+
Foundation's software and to any other program whose authors commit to<br />
+
using it.  (Some other Free Software Foundation software is covered by<br />
+
the GNU Library General Public License instead.)  You can apply it to<br />
+
your programs, too.<br />
+
<br />
+
  When we speak of free software, we are referring to freedom, not<br />
+
price.  Our General Public Licenses are designed to make sure that you<br />
+
have the freedom to distribute copies of free software (and charge for<br />
+
this service if you wish), that you receive source code or can get it<br />
+
if you want it, that you can change the software or use pieces of it<br />
+
in new free programs; and that you know you can do these things.<br />
+
<br />
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  To protect your rights, we need to make restrictions that forbid<br />
+
anyone to deny you these rights or to ask you to surrender the rights.<br />
+
These restrictions translate to certain responsibilities for you if you<br />
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distribute copies of the software, or if you modify it.<br />
+
<br />
+
  For example, if you distribute copies of such a program, whether
+
gratis or for a fee, you must give the recipients all the rights that
+
you have.  You must make sure that they, too, receive or can get the
+
source code.  And you must show them these terms so they know their
+
rights.
+
  
  We protect your rights with two steps: (1) copyright the software, and
 
(2) offer you this license which gives you legal permission to copy,
 
distribute and/or modify the software.
 
  
  Also, for each author's protection and ours, we want to make certain
+
# The freedom to run the program, for any purpose
that everyone understands that there is no warranty for this free
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# The freedom to study how the program works, and change it to meet your needs
software.  If the software is modified by someone else and passed on, we
+
# The freedom to redistribute for the benefit of others
want its recipients to know that what they have is not the original, so
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# The freedom to distribute modified versions to give the entire community chance to benefit.
that any problems introduced by others will not reflect on the original
+
authors' reputations.
+
  
  Finally, any free program is threatened constantly by software
 
patents.  We wish to avoid the danger that redistributors of a free
 
program will individually obtain patent licenses, in effect making the
 
program proprietary.  To prevent this, we have made it clear that any
 
patent must be licensed for everyone's free use or not licensed at all.
 
  
  The precise terms and conditions for copying, distribution and
+
The license permits users to use, modify and redistribute the software under certain conditions. These, essentially, are
modification follow.
+
  
GNU GENERAL PUBLIC LICENSE
 
  TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
  
  0. This License applies to any program or other work which contains
+
* Any redistribution must take place under the GPL
a notice placed by the copyright holder saying it may be distributed
+
* The source code must be made available by anyone distributing either the original software of the modification
under the terms of this General Public License.  The "Program", below,
+
* The software must be accompanied by either a copy of the GPL or information on where to find a copy of the license.
refers to any such program or work, and a "work based on the Program"
+
means either the Program or any derivative work under copyright law:
+
that is to say, a work containing the Program or a portion of it,
+
either verbatim or with modifications and/or translated into another
+
language.  (Hereinafter, translation is included without limitation in
+
the term "modification".)  Each licensee is addressed as "you".
+
  
Activities other than copying, distribution and modification are not
 
covered by this License; they are outside its scope.  The act of
 
running the Program is not restricted, and the output from the Program
 
is covered only if its contents constitute a work based on the
 
Program (independent of having been made by running the Program).
 
Whether that is true depends on what the Program does.
 
  
  1. You may copy and distribute verbatim copies of the Program's
+
If you receive software licensed under the GNU GPL without source code (or an offer of the same) then this is likely to be a violation of the GPL and should be reported by following the steps published by GNU [http://www.gnu.org/licenses/gpl-violation.html here].
source code as you receive it, in any medium, provided that you
+
conspicuously and appropriately publish on each copy an appropriate
+
copyright notice and disclaimer of warranty; keep intact all the
+
notices that refer to this License and to the absence of any warranty;
+
and give any other recipients of the Program a copy of this License
+
along with the Program.
+
  
You may charge a fee for the physical act of transferring a copy, and
 
you may at your option offer warranty protection in exchange for a fee.
 
  
  2. You may modify your copy or copies of the Program or any portion
+
The GNU GPL V2 was replaced by GPL V3 in June 2007 (The main changes being to prevent so-called Tivo-isation). Developers do, however, remain free to license their software under V2. All projects will contain details of which version they are licensed under (usually in the headers). Some will contain the text
of it, thus forming a work based on the Program, and copy and
+
distribute such modifications or work under the terms of Section 1
+
above, provided that you also meet all of these conditions:
+
  
a) You must cause the modified files to carry prominent notices
 
stating that you changed the files and the date of any change.
 
  
b) You must cause any work that you distribute or publish, that in
+
''Licensed under the GNU General Public License V2 or any later version''
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.
+
  
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
 
notice that there is no warranty (or else, saying that you provide
 
a warranty) and that users may redistribute the program under
 
these conditions, and telling the user how to view a copy of this
 
License.  (Exception: if the Program itself is interactive but
 
does not normally print such an announcement, your work based on
 
the Program is not required to print an announcement.)
 
  
These requirements apply to the modified work as a whole.  If
+
This essentially means that if the specified version has been superseded, you (as the user) have the option to abide either by the specified version of any later version of the GNU GPL.
identifiable sections of that work are not derived from the Program,
+
and can be reasonably considered independent and separate works in
+
themselves, then this License, and its terms, do not apply to those
+
sections when you distribute them as separate works.  But when you
+
distribute the same sections as part of a whole which is a work based
+
on the Program, the distribution of the whole must be on the terms of
+
this License, whose permissions for other licensees extend to the
+
entire whole, and thus to each and every part regardless of who wrote it.
+
  
Thus, it is not the intent of this section to claim rights or contest
+
The Joomla project is licensed under "GPL Version 2 or later", but users should be aware that the authors of some extensions may have explicitly opted to license their components under GPL V3.
your rights to work written entirely by you; rather, the intent is to
+
exercise the right to control the distribution of derivative or
+
collective works based on the Program.
+
  
In addition, mere aggregation of another work not based on the Program
 
with the Program (or with a work based on the Program) on a volume of
 
a storage or distribution medium does not bring the other work under
 
the scope of this License.
 
  
  3. You may copy and distribute the Program (or a work based on it,
+
You can view the GNU GPL V2 License in full on the [http://www.gnu.org/licenses/gpl-2.0.html GNU Site]
under Section 2) in object code or executable form under the terms of
+
Sections 1 and 2 above provided that you also do one of the following:
+
  
a) Accompany it with the complete corresponding machine-readable
 
source code, which must be distributed under the terms of Sections
 
1 and 2 above on a medium customarily used for software interchange; or,
 
  
b) Accompany it with a written offer, valid for at least three
 
years, to give any third party, for a charge no more than your
 
cost of physically performing source distribution, a complete
 
machine-readable copy of the corresponding source code, to be
 
distributed under the terms of Sections 1 and 2 above on a medium
 
customarily used for software interchange; or,
 
  
c) Accompany it with the information you received as to the offer
 
to distribute corresponding source code.  (This alternative is
 
allowed only for noncommercial distribution and only if you
 
received the program in object code or executable form with such
 
an offer, in accord with Subsection b above.)
 
  
The source code for a work means the preferred form of the work for
 
making modifications to it.  For an executable work, complete source
 
code means all the source code for all modules it contains, plus any
 
associated interface definition files, plus the scripts used to
 
control compilation and installation of the executable.  However, as a
 
special exception, the source code distributed need not include
 
anything that is normally distributed (in either source or binary
 
form) with the major components (compiler, kernel, and so on) of the
 
operating system on which the executable runs, unless that component
 
itself accompanies the executable.
 
  
If distribution of executable or object code is made by offering
 
access to copy from a designated place, then offering equivalent
 
access to copy the source code from the same place counts as
 
distribution of the source code, even though third parties are not
 
compelled to copy the source along with the object code.
 
 
  4. You may not copy, modify, sublicense, or distribute the Program
 
except as expressly provided under this License.  Any attempt
 
otherwise to copy, modify, sublicense or distribute the Program is
 
void, and will automatically terminate your rights under this License.
 
However, parties who have received copies, or rights, from you under
 
this License will not have their licenses terminated so long as such
 
parties remain in full compliance.
 
  
  5. You are not required to accept this License, since you have not
 
signed it.  However, nothing else grants you permission to modify or
 
distribute the Program or its derivative works.  These actions are
 
prohibited by law if you do not accept this License.  Therefore, by
 
modifying or distributing the Program (or any work based on the
 
Program), you indicate your acceptance of this License to do so, and
 
all its terms and conditions for copying, distributing or modifying
 
the Program or works based on it.
 
  
  6. Each time you redistribute the Program (or any work based on the
 
Program), the recipient automatically receives a license from the
 
original licensor to copy, distribute or modify the Program subject to
 
these terms and conditions.  You may not impose any further
 
restrictions on the recipients' exercise of the rights granted herein.
 
You are not responsible for enforcing compliance by third parties to
 
this License.
 
  
  7. If, as a consequence of a court judgment or allegation of patent
+
[[Category:Stubs]]
infringement or for any other reason (not limited to patent issues),
+
conditions are imposed on you (whether by court order, agreement or
+
otherwise) 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.  For example, if a patent
+
license would not permit royalty-free redistribution of the Program by
+
all those who receive copies directly or indirectly through you, then
+
the only way you could satisfy both it and this License would be to
+
refrain entirely from distribution of the Program.
+
 
+
If any portion of this section is held invalid or unenforceable under
+
any particular circumstance, the balance of the section is intended to
+
apply and the section as a whole is intended to apply in other
+
circumstances.
+
 
+
It is not the purpose of this section to induce you to infringe any
+
patents or other property right claims or to contest validity of any
+
such claims; this section has the sole purpose of protecting the
+
integrity of the free software distribution system, which is
+
implemented by public license practices.  Many people have made
+
generous contributions to the wide range of software distributed
+
through that system in reliance on consistent application of that
+
system; it is up to the author/donor to decide if he or she is willing
+
to distribute software through any other system and a licensee cannot
+
impose that choice.
+
 
+
This section is intended to make thoroughly clear what is believed to
+
be a consequence of the rest of this License.
+
 
+
  8. If the distribution and/or use of the Program is restricted in
+
certain countries either by patents or by copyrighted interfaces, the
+
original copyright holder who places the Program under this License
+
may add an explicit geographical distribution limitation excluding
+
those countries, so that distribution is permitted only in or among
+
countries not thus excluded.  In such case, this License incorporates
+
the limitation as if written in the body of this License.
+
 
+
  9. The Free Software Foundation may publish revised and/or new versions
+
of the General Public License from time to time.  Such new versions will
+
be similar in spirit to the present version, but may differ in detail to
+
address new problems or concerns.
+
 
+
Each version is given a distinguishing version number.  If the Program
+
specifies a version number of this License which applies to it and "any
+
later version", you have the option of following the terms and conditions
+
either of that version or of any later version published by the Free
+
Software Foundation.  If the Program does not specify a version number of
+
this License, you may choose any version ever published by the Free Software
+
Foundation.
+
 
+
  10. If you wish to incorporate parts of the Program into other free
+
programs whose distribution conditions are different, write to the author
+
to ask for permission.  For software which is copyrighted by the Free
+
Software Foundation, write to the Free Software Foundation; we sometimes
+
make exceptions for this.  Our decision will be guided by the two goals
+
of preserving the free status of all derivatives of our free software and
+
of promoting the sharing and reuse of software generally.
+
 
+
NO WARRANTY
+
 
+
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+
REPAIR OR CORRECTION.
+
 
+
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+
POSSIBILITY OF SUCH DAMAGES.
+
 
+
END OF TERMS AND CONDITIONS
+
 
+
How to Apply These Terms to Your New Programs
+
 
+
  If you develop a new program, and you want it to be of the greatest
+
possible use to the public, the best way to achieve this is to make it
+
free software which everyone can redistribute and change under these terms.
+
 
+
  To do so, attach the following notices to the program.  It is safest
+
to attach them to the start of each source file to most effectively
+
convey the exclusion of warranty; and each file should have at least
+
the "copyright" line and a pointer to where the full notice is found.
+
 
+
<one line to give the program's name and a brief idea of what it does.>
+
Copyright (C) <year>  <name of author>
+
 
+
This program is free software; you can redistribute it and/or modify
+
it under the terms of the GNU General Public License as published by
+
the Free Software Foundation; either version 2 of the License, or
+
(at your option) any later version.
+
 
+
This program is distributed in the hope that it will be useful,
+
but WITHOUT ANY WARRANTY; without even the implied warranty of
+
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+
GNU General Public License for more details.
+
 
+
You should have received a copy of the GNU General Public License
+
along with this program; if not, write to the Free Software
+
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
 
+
 
+
Also add information on how to contact you by electronic and paper mail.
+
 
+
If the program is interactive, make it output a short notice like this
+
when it starts in an interactive mode:
+
 
+
Gnomovision version 69, Copyright (C) year name of author
+
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+
This is free software, and you are welcome to redistribute it
+
under certain conditions; type `show c' for details.
+
 
+
The hypothetical commands `show w' and `show c' should show the appropriate
+
parts of the General Public License.  Of course, the commands you use may
+
be called something other than `show w' and `show c'; they could even be
+
mouse-clicks or menu items--whatever suits your program.
+
 
+
You should also get your employer (if you work as a programmer) or your
+
school, if any, to sign a "copyright disclaimer" for the program, if
+
necessary.  Here is a sample; alter the names:
+
 
+
  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+
  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
 
+
  <signature of Ty Coon>, 1 April 1989
+
  Ty Coon, President of Vice
+
 
+
This General Public License does not permit incorporating your program into
+
proprietary programs.  If your program is a subroutine library, you may
+
consider it more useful to permit linking proprietary applications with the
+
library.  If this is what you want to do, use the GNU Library General
+
Public License instead of this License.
+
</nowiki>
+

Revision as of 06:50, 25 June 2012

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The GNU General Public License V2 is a 'copyleft' license designed to protect the rights of users whilst still providing protection to the author of the software. It is intended to ensure the following rights for users


  1. The freedom to run the program, for any purpose
  2. The freedom to study how the program works, and change it to meet your needs
  3. The freedom to redistribute for the benefit of others
  4. The freedom to distribute modified versions to give the entire community chance to benefit.


The license permits users to use, modify and redistribute the software under certain conditions. These, essentially, are


  • Any redistribution must take place under the GPL
  • The source code must be made available by anyone distributing either the original software of the modification
  • The software must be accompanied by either a copy of the GPL or information on where to find a copy of the license.


If you receive software licensed under the GNU GPL without source code (or an offer of the same) then this is likely to be a violation of the GPL and should be reported by following the steps published by GNU here.


The GNU GPL V2 was replaced by GPL V3 in June 2007 (The main changes being to prevent so-called Tivo-isation). Developers do, however, remain free to license their software under V2. All projects will contain details of which version they are licensed under (usually in the headers). Some will contain the text


Licensed under the GNU General Public License V2 or any later version


This essentially means that if the specified version has been superseded, you (as the user) have the option to abide either by the specified version of any later version of the GNU GPL.

The Joomla project is licensed under "GPL Version 2 or later", but users should be aware that the authors of some extensions may have explicitly opted to license their components under GPL V3.


You can view the GNU GPL V2 License in full on the GNU Site