GNU 通用公共许可证GPL


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GNU 通用公共许可证GPL

摘要

GNU GENERAL PUBLIC LICENSE
Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

GNU GENERAL PUBLIC LICENSE
Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Library 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., 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.

 

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