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📁 SEAL是DOS 下的32位保护模式的GUI程序
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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
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restrictions translate to certain responsibilities for you if you
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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
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Finally, any free program is threatened constantly by software patents. We
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licensed for everyone's free use or not licensed at all. 

The precise terms and conditions for copying, distribution and modification
follow. 

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
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which the executable runs, unless that component itself accompanies the
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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. 

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