␉ GNU GENERAL PUBLIC LICENSE␊ |
␉␉ Version 2, June 1991␊ |
␊ |
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,␊ |
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA␊ |
Everyone is permitted to copy and distribute verbatim copies␊ |
of this license document, but changing it is not allowed.␊ |
␊ |
␉␉␉ Preamble␊ |
␊ |
The licenses for most software are designed to take away your␊ |
freedom to share and change it. By contrast, the GNU General Public␊ |
License is intended to guarantee your freedom to share and change free␊ |
software--to make sure the software is free for all its users. This␊ |
General Public License applies to most of the Free Software␊ |
Foundation's software and to any other program whose authors commit to␊ |
using it. (Some other Free Software Foundation software is covered by␊ |
the GNU Lesser General Public License instead.) You can apply it to␊ |
your programs, too.␊ |
␊ |
When we speak of free software, we are referring to freedom, not␊ |
price. Our General Public Licenses are designed to make sure that you␊ |
have the freedom to distribute copies of free software (and charge for␊ |
this service if you wish), that you receive source code or can get it␊ |
if you want it, that you can change the software or use pieces of it␊ |
in new free programs; and that you know you can do these things.␊ |
␊ |
To protect your rights, we need to make restrictions that forbid␊ |
anyone to deny you these rights or to ask you to surrender the rights.␊ |
These restrictions translate to certain responsibilities for you if you␊ |
distribute copies of the software, or if you modify it.␊ |
␊ |
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␊ |
that everyone understands that there is no warranty for this free␊ |
software. If the software is modified by someone else and passed on, we␊ |
want its recipients to know that what they have is not the original, so␊ |
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␊ |
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␊ |
a notice placed by the copyright holder saying it may be distributed␊ |
under the terms of this General Public License. The "Program", below,␊ |
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␊ |
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␊ |
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␊ |
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␊ |
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␊ |
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,␊ |
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␊ |
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.,␊ |
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 Lesser General␊ |
Public License instead of this License.␊ |
␊ |