lgpl.txt

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

	  GNU LIBRARY GENERAL PUBLIC LICENSE
	  ==================================
                Version 2, June 1991

 Copyright (C) 1991 Free Software Foundation, Inc.
                    675 Mass Ave, Cambridge, MA 02139, USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

[This is the first released version of the library GPL.  It is
 numbered 2 because it goes with version 2 of the ordinary GPL.]

                        Preamble

The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General
Public Licenses are intended to guarantee your freedom to share
and change free software--to make sure the software is free for
all its users.

This license, the Library General Public License, applies to
some specially designated Free Software Foundation software, and
to any other libraries whose authors decide to use it.  You can
use it for your libraries, 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 library, or if you
modify it.

For example, if you distribute copies of the library, whether
gratis or for a fee, you must give the recipients all the rights
that we gave you.  You must make sure that they, too, receive or
can get the source code.  If you link a program with the
library, you must provide complete object files to the
recipients so that they can relink them with the library, after
making changes to the library and recompiling it.  And you must
show them these terms so they know their rights.

Our method of protecting your rights has two steps: (1)
copyright the library, and (2) offer you this license which
gives you legal permission to copy, distribute and/or modify the
library.

Also, for each distributor's protection, we want to make certain
that everyone understands that there is no warranty for this
free library.  If the library is modified by someone else and
passed on, we want its recipients to know that what they have is
not the original version, 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 companies
distributing free software will individually obtain patent
licenses, thus in effect transforming the program into
proprietary software.  To prevent this, we have made it clear
that any patent must be licensed for everyone's free use or not
licensed at all.

Most GNU software, including some libraries, is covered by the
ordinary GNU General Public License, which was designed for
utility programs.  This license, the GNU Library General Public
License, applies to certain designated libraries.  This license
is quite different from the ordinary one; be sure to read it in
full, and don't assume that anything in it is the same as in the
ordinary license.

The reason we have a separate public license for some libraries
is that they blur the distinction we usually make between
modifying or adding to a program and simply using it.  Linking a
program with a library, without changing the library, is in some
sense simply using the library, and is analogous to running a
utility program or application program.  However, in a textual
and legal sense, the linked executable is a combined work, a
derivative of the original library, and the ordinary General
Public License treats it as such.

Because of this blurred distinction, using the ordinary General
Public License for libraries did not effectively promote
software sharing, because most developers did not use the
libraries.  We concluded that weaker conditions might promote
sharing better.

However, unrestricted linking of non-free programs would deprive
the users of those programs of all benefit from the free status
of the libraries themselves.  This Library General Public
License is intended to permit developers of non-free programs to
use free libraries, while preserving your freedom as a user of
such programs to change the free libraries that are incorporated
in them.  (We have not seen how to achieve this as regards
changes in header files, but we have achieved it as regards
changes in the actual functions of the Library.)  The hope is
that this will lead to faster development of free libraries.

The precise terms and conditions for copying, distribution and
modification follow.  Pay close attention to the difference
between a "work based on the library" and a "work that uses the
library".  The former contains code derived from the library,
while the latter only works together with the library.

Note that it is possible for a library to be covered by the
ordinary General Public License rather than by this special one.

                GNU LIBRARY GENERAL PUBLIC LICENSE
 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

0. This License Agreement applies to any software library which
contains a notice placed by the copyright holder or other
authorized party saying it may be distributed under the terms of
this Library General Public License (also called "this
License").  Each licensee is addressed as "you".

A "library" means a collection of software functions and/or data
prepared so as to be conveniently linked with application
programs (which use some of those functions and data) to form
executables.

The "Library", below, refers to any such software library or
work which has been distributed under these terms.  A "work
based on the Library" means either the Library or any derivative
work under copyright law: that is to say, a work containing the
Library or a portion of it, either verbatim or with
modifications and/or translated straightforwardly into another
language.  (Hereinafter, translation is included without
limitation in the term "modification".)

"Source code" for a work means the preferred form of the work
for making modifications to it.  For a library, 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 library.

Activities other than copying, distribution and modification are
not covered by this License; they are outside its scope.  The
act of running a program using the Library is not restricted,
and output from such a program is covered only if its contents
constitute a work based on the Library (independent of the use
of the Library in a tool for writing it).  Whether that is true
depends on what the Library does and what the program that uses
the Library does.
  
1. You may copy and distribute verbatim copies of the Library's
complete 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 distribute a copy of this License
along with the Library.

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 Library or any
portion of it, thus forming a work based on the Library, 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) The modified work must itself be a software library.

    b) You must cause the files modified to carry prominent notices
    stating that you changed the files and the date of any change.

    c) You must cause the whole of the work to be licensed at no
    charge to all third parties under the terms of this License.

    d) If a facility in the modified Library refers to a function or a
    table of data to be supplied by an application program that uses
    the facility, other than as an argument passed when the facility
    is invoked, then you must make a good faith effort to ensure that,
    in the event an application does not supply such function or
    table, the facility still operates, and performs whatever part of
    its purpose remains meaningful.

    (For example, a function in a library to compute square roots has
    a purpose that is entirely well-defined independent of the
    application.  Therefore, Subsection 2d requires that any
    application-supplied function or table used by this function must
    be optional: if the application does not supply it, the square
    root function must still compute square roots.)

These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the
Library, 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 Library, 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 Library.

In addition, mere aggregation of another work not based on the
Library with the Library (or with a work based on the Library)
on a volume of a storage or distribution medium does not bring
the other work under the scope of this License.

3. You may opt to apply the terms of the ordinary GNU General
Public License instead of this License to a given copy of the
Library.  To do this, you must alter all the notices that refer
to this License, so that they refer to the ordinary GNU General
Public License, version 2, instead of to this License.  (If a
newer version than version 2 of the ordinary GNU General Public
License has appeared, then you can specify that version instead
if you wish.)  Do not make any other change in these notices.
 
Once this change is made in a given copy, it is irreversible for
that copy, so the ordinary GNU General Public License applies to
all subsequent copies and derivative works made from that copy.

This option is useful when you wish to copy part of the code of
the Library into a program that is not a library.

4. You may copy and distribute the Library (or a portion or
derivative of it, under Section 2) in object code or executable
form under the terms of Sections 1 and 2 above provided that you
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.

If distribution of 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 satisfies the
requirement to distribute the source code, even though third
parties are not compelled to copy the source along with the
object code.

5. A program that contains no derivative of any portion of the
Library, but is designed to work with the Library by being
compiled or linked with it, is called a "work that uses the
Library".  Such a work, in isolation, is not a derivative work
of the Library, and therefore falls outside the scope of this
License.

However, linking a "work that uses the Library" with the Library
creates an executable that is a derivative of the Library
(because it contains portions of the Library), rather than a
"work that uses the library".  The executable is therefore
covered by this License. Section 6 states terms for distribution
of such executables.