| 1 |                   GNU LIBRARY GENERAL PUBLIC LICENSE
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| 2 |                        Version 2, June 1991
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| 3 | 
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| 4 |  Copyright (C) 1991 Free Software Foundation, Inc.
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| 5 |  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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| 6 |  Everyone is permitted to copy and distribute verbatim copies
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| 7 |  of this license document, but changing it is not allowed.
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| 8 | 
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| 9 | [This is the first released version of the library GPL.  It is
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| 10 |  numbered 2 because it goes with version 2 of the ordinary GPL.]
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| 11 | 
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| 12 |                             Preamble
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| 13 | 
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| 14 |   The licenses for most software are designed to take away your
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| 15 | freedom to share and change it.  By contrast, the GNU General Public
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| 16 | Licenses are intended to guarantee your freedom to share and change
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| 17 | free software--to make sure the software is free for all its users.
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| 18 | 
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| 19 |   This license, the Library General Public License, applies to some
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| 20 | specially designated Free Software Foundation software, and to any
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| 21 | other libraries whose authors decide to use it.  You can use it for
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| 22 | your libraries, too.
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| 23 | 
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| 24 |   When we speak of free software, we are referring to freedom, not
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| 25 | price.  Our General Public Licenses are designed to make sure that you
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| 26 | have the freedom to distribute copies of free software (and charge for
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| 27 | this service if you wish), that you receive source code or can get it
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| 28 | if you want it, that you can change the software or use pieces of it
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| 29 | in new free programs; and that you know you can do these things.
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| 30 | 
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| 31 |   To protect your rights, we need to make restrictions that forbid
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| 32 | anyone to deny you these rights or to ask you to surrender the rights.
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| 33 | These restrictions translate to certain responsibilities for you if
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| 34 | you distribute copies of the library, or if you modify it.
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| 35 | 
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| 36 |   For example, if you distribute copies of the library, whether gratis
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| 37 | or for a fee, you must give the recipients all the rights that we gave
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| 38 | you.  You must make sure that they, too, receive or can get the source
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| 39 | code.  If you link a program with the library, you must provide
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| 40 | complete object files to the recipients so that they can relink them
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| 41 | with the library, after making changes to the library and recompiling
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| 42 | it.  And you must show them these terms so they know their rights.
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| 43 | 
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| 44 |   Our method of protecting your rights has two steps: (1) copyright
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| 45 | the library, and (2) offer you this license which gives you legal
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| 46 | permission to copy, distribute and/or modify the library.
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| 47 | 
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| 48 |   Also, for each distributor's protection, we want to make certain
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| 49 | that everyone understands that there is no warranty for this free
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| 53 | the original authors' reputations.
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| 54 |  | 
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| 55 | 
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| 56 |   Finally, any free program is threatened constantly by software
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| 57 | patents.  We wish to avoid the danger that companies distributing free
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| 58 | software will individually obtain patent licenses, thus in effect
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| 59 | transforming the program into proprietary software.  To prevent this,
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| 60 | we have made it clear that any patent must be licensed for everyone's
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| 61 | free use or not licensed at all.
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| 62 | 
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| 63 |   Most GNU software, including some libraries, is covered by the ordinary
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| 64 | GNU General Public License, which was designed for utility programs.  This
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| 65 | license, the GNU Library General Public License, applies to certain
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| 66 | designated libraries.  This license is quite different from the ordinary
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| 67 | one; be sure to read it in full, and don't assume that anything in it is
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| 68 | the same as in the ordinary license.
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| 69 | 
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| 70 |   The reason we have a separate public license for some libraries is that
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| 71 | they blur the distinction we usually make between modifying or adding to a
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| 72 | program and simply using it.  Linking a program with a library, without
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| 73 | changing the library, is in some sense simply using the library, and is
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| 74 | analogous to running a utility program or application program.  However, in
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| 75 | a textual and legal sense, the linked executable is a combined work, a
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| 76 | derivative of the original library, and the ordinary General Public License
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| 77 | treats it as such.
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| 78 | 
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| 79 |   Because of this blurred distinction, using the ordinary General
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| 80 | Public License for libraries did not effectively promote software
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| 81 | sharing, because most developers did not use the libraries.  We
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| 82 | concluded that weaker conditions might promote sharing better.
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| 83 | 
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| 84 |   However, unrestricted linking of non-free programs would deprive the
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| 85 | users of those programs of all benefit from the free status of the
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| 86 | libraries themselves.  This Library General Public License is intended to
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| 87 | permit developers of non-free programs to use free libraries, while
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| 88 | preserving your freedom as a user of such programs to change the free
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| 93 | 
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| 98 | works together with the library.
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| 99 | 
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| 100 |   Note that it is possible for a library to be covered by the ordinary
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| 102 |  | 
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| 103 | 
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| 104 |                   GNU LIBRARY GENERAL PUBLIC LICENSE
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| 105 |    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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| 106 | 
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| 107 |   0. This License Agreement applies to any software library which
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| 108 | contains a notice placed by the copyright holder or other authorized
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| 109 | party saying it may be distributed under the terms of this Library
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| 112 | 
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| 113 |   A "library" means a collection of software functions and/or data
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| 169 |     in the event an application does not supply such function or
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| 170 |     table, the facility still operates, and performs whatever part of
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| 171 |     its purpose remains meaningful.
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| 173 |     (For example, a function in a library to compute square roots has
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| 176 |     application-supplied function or table used by this function must
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| 177 |     be optional: if the application does not supply it, the square
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| 178 |     root function must still compute square roots.)
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| 191 | Thus, it is not the intent of this section to claim rights or contest
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| 201 |   3. You may opt to apply the terms of the ordinary GNU General Public
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| 241 | Section 6 states terms for distribution of such executables.
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| 243 |   When a "work that uses the Library" uses material from a header file
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| 262 | 
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| 263 |   6. As an exception to the Sections above, you may also compile or
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| 270 |   You must give prominent notice with each copy of the work that the
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| 271 | Library is used in it and that the Library and its use are covered by
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| 272 | this License.  You must supply a copy of this License.  If the work
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| 273 | during execution displays copyright notices, you must include the
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| 274 | copyright notice for the Library among them, as well as a reference
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| 276 | of these things:
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| 278 |     a) Accompany the work with the complete corresponding
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| 286 |     that the user who changes the contents of definitions files in the
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| 290 |     b) Accompany the work with a written offer, valid for at
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| 291 |     least three years, to give the same user the materials
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| 292 |     specified in Subsection 6a, above, for a charge no more
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| 293 |     than the cost of performing this distribution.
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| 295 |     c) If distribution of the work is made by offering access to copy
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| 299 |     d) Verify that the user has already received a copy of these
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| 300 |     materials or that you have already sent this user a copy.
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| 303 | Library" must include any data and utility programs needed for
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| 305 | the source code distributed need not include anything that is normally
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| 306 | distributed (in either source or binary form) with the major
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| 315 | distribute.
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| 318 |   7. You may place library facilities that are a work based on the
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| 325 |     a) Accompany the combined library with a copy of the same work
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| 334 |   8. You may not copy, modify, sublicense, link with, or distribute
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| 342 |   9. You are not required to accept this License, since you have not
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| 356 | You are not responsible for enforcing compliance by third parties to
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| 360 |   11. If, as a consequence of a court judgment or allegation of patent
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| 368 | license would not permit royalty-free redistribution of the Library by
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| 369 | all those who receive copies directly or indirectly through you, then
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| 370 | the only way you could satisfy both it and this License would be to
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| 371 | refrain entirely from distribution of the Library.
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| 372 | 
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| 373 | If any portion of this section is held invalid or unenforceable under any
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| 374 | particular circumstance, the balance of the section is intended to apply,
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| 375 | and the section as a whole is intended to apply in other circumstances.
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| 376 | 
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| 377 | It is not the purpose of this section to induce you to infringe any
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| 378 | patents or other property right claims or to contest validity of any
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| 379 | such claims; this section has the sole purpose of protecting the
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| 380 | integrity of the free software distribution system which is
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| 381 | implemented by public license practices.  Many people have made
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| 382 | generous contributions to the wide range of software distributed
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| 383 | through that system in reliance on consistent application of that
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| 384 | system; it is up to the author/donor to decide if he or she is willing
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| 385 | to distribute software through any other system and a licensee cannot
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| 386 | impose that choice.
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| 387 | 
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| 388 | This section is intended to make thoroughly clear what is believed to
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| 389 | be a consequence of the rest of this License.
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| 390 | 
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| 391 |   12. If the distribution and/or use of the Library is restricted in
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| 392 | certain countries either by patents or by copyrighted interfaces, the
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| 393 | original copyright holder who places the Library under this License may add
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| 394 | an explicit geographical distribution limitation excluding those countries,
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| 395 | so that distribution is permitted only in or among countries not thus
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| 396 | excluded.  In such case, this License incorporates the limitation as if
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| 397 | written in the body of this License.
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| 398 | 
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| 399 |   13. The Free Software Foundation may publish revised and/or new
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| 400 | versions of the Library General Public License from time to time.
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| 401 | Such new versions will be similar in spirit to the present version,
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| 402 | but may differ in detail to address new problems or concerns.
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| 403 | 
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| 404 | Each version is given a distinguishing version number.  If the Library
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| 405 | specifies a version number of this License which applies to it and
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| 406 | "any later version", you have the option of following the terms and
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| 407 | conditions either of that version or of any later version published by
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| 408 | the Free Software Foundation.  If the Library does not specify a
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| 409 | license version number, you may choose any version ever published by
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| 410 | the Free Software Foundation.
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| 411 |  | 
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| 412 | 
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| 413 |   14. If you wish to incorporate parts of the Library into other free
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| 414 | programs whose distribution conditions are incompatible with these,
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| 415 | write to the author to ask for permission.  For software which is
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| 416 | copyrighted by the Free Software Foundation, write to the Free
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| 417 | Software Foundation; we sometimes make exceptions for this.  Our
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| 418 | decision will be guided by the two goals of preserving the free status
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| 419 | of all derivatives of our free software and of promoting the sharing
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| 420 | and reuse of software generally.
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| 421 | 
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| 422 |                             NO WARRANTY
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| 423 | 
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| 424 |   15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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| 425 | WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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| 426 | EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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| 427 | OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
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| 428 | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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| 429 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 430 | PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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| 431 | LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
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| 432 | THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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| 433 | 
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| 434 |   16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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| 435 | WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
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| 436 | AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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| 437 | FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
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| 438 | CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
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| 439 | LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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| 440 | RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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| 441 | FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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| 442 | SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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| 443 | DAMAGES.
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| 444 | 
 | 
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| 445 |                      END OF TERMS AND CONDITIONS
 | 
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| 446 |  | 
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| 447 | 
 | 
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| 448 |      Appendix: How to Apply These Terms to Your New Libraries
 | 
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| 449 | 
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| 450 |   If you develop a new library, and you want it to be of the greatest
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| 451 | possible use to the public, we recommend making it free software that
 | 
|---|
| 452 | everyone can redistribute and change.  You can do so by permitting
 | 
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| 453 | redistribution under these terms (or, alternatively, under the terms of the
 | 
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| 454 | ordinary General Public License).
 | 
|---|
| 455 | 
 | 
|---|
| 456 |   To apply these terms, attach the following notices to the library.  It is
 | 
|---|
| 457 | safest to attach them to the start of each source file to most effectively
 | 
|---|
| 458 | convey the exclusion of warranty; and each file should have at least the
 | 
|---|
| 459 | "copyright" line and a pointer to where the full notice is found.
 | 
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| 460 | 
 | 
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| 461 |     <one line to give the library's name and a brief idea of what it does.>
 | 
|---|
| 462 |     Copyright (C) <year>  <name of author>
 | 
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| 463 | 
 | 
|---|
| 464 |     This library is free software; you can redistribute it and/or
 | 
|---|
| 465 |     modify it under the terms of the GNU Library General Public
 | 
|---|
| 466 |     License as published by the Free Software Foundation; either
 | 
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| 467 |     version 2 of the License, or (at your option) any later version.
 | 
|---|
| 468 | 
 | 
|---|
| 469 |     This library is distributed in the hope that it will be useful,
 | 
|---|
| 470 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
 | 
|---|
| 471 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 | 
|---|
| 472 |     Library General Public License for more details.
 | 
|---|
| 473 | 
 | 
|---|
| 474 |     You should have received a copy of the GNU Library General Public
 | 
|---|
| 475 |     License along with this library; if not, write to the Free
 | 
|---|
| 476 |     Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 | 
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| 477 |     MA 02111-1307, USA
 | 
|---|
| 478 | 
 | 
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| 479 | Also add information on how to contact you by electronic and paper mail.
 | 
|---|
| 480 | 
 | 
|---|
| 481 | You should also get your employer (if you work as a programmer) or your
 | 
|---|
| 482 | school, if any, to sign a "copyright disclaimer" for the library, if
 | 
|---|
| 483 | necessary.  Here is a sample; alter the names:
 | 
|---|
| 484 | 
 | 
|---|
| 485 |   Yoyodyne, Inc., hereby disclaims all copyright interest in the
 | 
|---|
| 486 |   library `Frob' (a library for tweaking knobs) written by James Random Hacker.
 | 
|---|
| 487 | 
 | 
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| 488 |   <signature of Ty Coon>, 1 April 1990
 | 
|---|
| 489 |   Ty Coon, President of Vice
 | 
|---|
| 490 | 
 | 
|---|
| 491 | That's all there is to it!
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