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167 lines
No EOL
25 KiB
Text
Executable file
GNU LIBRARY GENERAL PUBLIC LICENSE
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Version 2, June 1991
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Copyright (C) 1991 Free Software Foundation, Inc.
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675 Mass Ave, Cambridge, MA 02139, USA
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Everyone is permitted to copy and distribute verbatim copies
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of this license document, but changing it is not allowed.
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[This is the first released version of the library GPL. It is
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numbered 2 because it goes with version 2 of the ordinary GPL.]
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Preamble
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The licenses for most software are designed to take away your
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freedom to share and change it. By contrast, the GNU General Public
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Licenses are intended to guarantee your freedom to share and change
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free software--to make sure the software is free for all its users.
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This license, the Library General Public License, applies to some
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specially designated Free Software Foundation software, and to any
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other libraries whose authors decide to use it. You can use it for
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your libraries, too.
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When we speak of free software, we are referring to freedom, not
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price. Our General Public Licenses are designed to make sure that you
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have the freedom to distribute copies of free software (and charge for
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this service if you wish), that you receive source code or can get it
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if you want it, that you can change the software or use pieces of it
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in new free programs; and that you know you can do these things.
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To protect your rights, we need to make restrictions that forbid
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anyone to deny you these rights or to ask you to surrender the rights.
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These restrictions translate to certain responsibilities for you if
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you distribute copies of the library, or if you modify it.
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For example, if you distribute copies of the library, whether gratis
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or for a fee, you must give the recipients all the rights that we gave
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you. You must make sure that they, too, receive or can get the source
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code. If you link a program with the library, you must provide
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complete object files to the recipients so that they can relink them
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with the library, after making changes to the library and recompiling
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it. And you must show them these terms so they know their rights.
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Our method of protecting your rights has two steps: (1) copyright
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the library, and (2) offer you this license which gives you legal
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permission to copy, distribute and/or modify the library.
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Also, for each distributor's protection, we want to make certain
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that everyone understands that there is no warranty for this free
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library. If the library is modified by someone else and passed on, we
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want its recipients to know that what they have is not the original
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version, so that any problems introduced by others will not reflect on
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the original authors' reputations.
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Finally, any free program is threatened constantly by software
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patents. We wish to avoid the danger that companies distributing free
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software will individually obtain patent licenses, thus in effect
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transforming the program into proprietary software. To prevent this,
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we have made it clear that any patent must be licensed for everyone's
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free use or not licensed at all.
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Most GNU software, including some libraries, is covered by the ordinary
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GNU General Public License, which was designed for utility programs. This
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license, the GNU Library General Public License, applies to certain
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designated libraries. This license is quite different from the ordinary
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one; be sure to read it in full, and don't assume that anything in it is
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the same as in the ordinary license.
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The reason we have a separate public license for some libraries is that
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they blur the distinction we usually make between modifying or adding to a
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program and simply using it. Linking a program with a library, without
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changing the library, is in some sense simply using the library, and is
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analogous to running a utility program or application program. However, in
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a textual and legal sense, the linked executable is a combined work, a
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derivative of the original library, and the ordinary General Public License
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treats it as such.
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Because of this blurred distinction, using the ordinary General
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Public License for libraries did not effectively promote software
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sharing, because most developers did not use the libraries. We
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concluded that weaker conditions might promote sharing better.
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However, unrestricted linking of non-free programs would deprive the
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users of those programs of all benefit from the free status of the
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libraries themselves. This Library General Public License is intended to
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permit developers of non-free programs to use free libraries, while
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preserving your freedom as a user of such programs to change the free
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libraries that are incorporated in them. (We have not seen how to achieve
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this as regards changes in header files, but we have achieved it as regards
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changes in the actual functions of the Library.) The hope is that this
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will lead to faster development of free libraries.
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The precise terms and conditions for copying, distribution and
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modification follow. Pay close attention to the difference between a
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"work based on the library" and a "work that uses the library". The
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former contains code derived from the library, while the latter only
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works together with the library.
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Note that it is possible for a library to be covered by the ordinary
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General Public License rather than by this special one.
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GNU LIBRARY GENERAL PUBLIC LICENSE
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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0. This License Agreement applies to any software library which
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contains a notice placed by the copyright holder or other authorized
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party saying it may be distributed under the terms of this Library
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General Public License (also called "this License"). Each licensee is
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addressed as "you".
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A "library" means a collection of software functions and/or data
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prepared so as to be conveniently linked with application programs
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(which use some of those functions and data) to form executables.
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The "Library", below, refers to any such software library or work
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which has been distributed under these terms. A "work based on the
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Library" means either the Library or any derivative work under
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copyright law: that is to say, a work containing the Library or a
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portion of it, either verbatim or with modifications and/or translated
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straightforwardly into another language. (Hereinafter, translation is
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included without limitation in the term "modification".)
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"Source code" for a work means the preferred form of the work for
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making modifications to it. For a library, complete source code means
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interface definition files, plus the scripts used to control compilation
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and installation of the library.
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Activities other than copying, distribution and modification are not
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covered by this License; they are outside its scope. The act of
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running a program using the Library is not restricted, and output from
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such a program is covered only if its contents constitute a work based
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on the Library (independent of the use of the Library in a tool for
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writing it). Whether that is true depends on what the Library does
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and what the program that uses the Library does.
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1. You may copy and distribute verbatim copies of the Library's
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complete source code as you receive it, in any medium, provided that
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you conspicuously and appropriately publish on each copy an
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appropriate copyright notice and disclaimer of warranty; keep intact
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all the notices that refer to this License and to the absence of any
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warranty; and distribute a copy of this License along with the
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Library.
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You may charge a fee for the physical act of transferring a copy,
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and you may at your option offer warranty protection in exchange for a
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fee.
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2. You may modify your copy or copies of the Library or any portion
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of it, thus forming a work based on the Library, and copy and
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distribute such modifications or work under the terms of Section 1
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above, provided that you also meet all of these conditions:
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a) The modified work must itself be a software library.
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b) You must cause the files modified to carry prominent notices
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stating that you changed the files and the date of any change.
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c) You must cause the whole of the work to be licensed at no
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charge to all third parties under the terms of this License.
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d) If a facility in the modified Library refers to a function or a
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table of data to be supplied by an application program that uses
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the facility, other than as an argument passed when the facility
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is invoked, then you must make a good faith effort to ensure that,
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in the event an application does not supply such function or
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table, the facility still operates, and performs what../make/ |