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    76 
       
    77 <h1>GNU Lesser General Public License</h1>
       
    78 
       
    79 <!-- BEGIN LICENSE TEXT -->
       
    80 
       
    81 <p>Version 2.1, February 1999</p>
       
    82 
       
    83 <pre>
       
    84 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
       
    85 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
       
    86 Everyone is permitted to copy and distribute verbatim copies
       
    87 of this license document, but changing it is not allowed.
       
    88 
       
    89 [This is the first released version of the Lesser GPL.  It also counts
       
    90  as the successor of the GNU Library Public License, version 2, hence
       
    91  the version number 2.1.]
       
    92 </pre>
       
    93 
       
    94 <h2>Preamble</h2>
       
    95 
       
    96 <p>The licenses for most software are designed to take away your
       
    97 freedom to share and change it. By contrast, the GNU General
       
    98 Public Licenses are intended to guarantee your freedom to share
       
    99 and change free software--to make sure the software is free for
       
   100 all its users.</p>
       
   101 
       
   102 <p>This license, the Lesser General Public License, applies to
       
   103 some specially designated software packages--typically
       
   104 libraries--of the Free Software Foundation and other authors who
       
   105 decide to use it. You can use it too, but we suggest you first
       
   106 think carefully about whether this license or the ordinary
       
   107 General Public License is the better strategy to use in any
       
   108 particular case, based on the explanations below.</p>
       
   109 
       
   110 <p>When we speak of free software, we are referring to freedom of
       
   111 use, not price. Our General Public Licenses are designed to make
       
   112 sure that you have the freedom to distribute copies of free
       
   113 software (and charge for this service if you wish); that you
       
   114 receive source code or can get it if you want it; that you can
       
   115 change the software and use pieces of it in new free programs;
       
   116 and that you are informed that you can do these things.</p>
       
   117 
       
   118 <p>To protect your rights, we need to make restrictions that
       
   119 forbid distributors to deny you these rights or to ask you to
       
   120 surrender these rights. These restrictions translate to certain
       
   121 responsibilities for you if you distribute copies of the library
       
   122 or if you modify it.</p>
       
   123 
       
   124 <p>For example, if you distribute copies of the library, whether
       
   125 gratis or for a fee, you must give the recipients all the rights
       
   126 that we gave you. You must make sure that they, too, receive or
       
   127 can get the source code. If you link other code with the library,
       
   128 you must provide complete object files to the recipients, so that
       
   129 they can relink them with the library after making changes to the
       
   130 library and recompiling it. And you must show them these terms so
       
   131 they know their rights.</p>
       
   132 
       
   133 <p>We protect your rights with a two-step method: (1) we
       
   134 copyright the library, and (2) we offer you this license, which
       
   135 gives you legal permission to copy, distribute and/or modify the
       
   136 library.</p>
       
   137 
       
   138 <p>To protect each distributor, we want to make it very clear
       
   139 that there is no warranty for the free library. Also, if the
       
   140 library is modified by someone else and passed on, the recipients
       
   141 should know that what they have is not the original version, so
       
   142 that the original author's reputation will not be affected by
       
   143 problems that might be introduced by others.</p>
       
   144 
       
   145 <p>Finally, software patents pose a constant threat to the
       
   146 existence of any free program. We wish to make sure that a
       
   147 company cannot effectively restrict the users of a free program
       
   148 by obtaining a restrictive license from a patent holder.
       
   149 Therefore, we insist that any patent license obtained for a
       
   150 version of the library must be consistent with the full freedom
       
   151 of use specified in this license.</p>
       
   152 
       
   153 <p>Most GNU software, including some libraries, is covered by the
       
   154 ordinary GNU General Public License. This license, the GNU Lesser
       
   155 General Public License, applies to certain designated libraries,
       
   156 and is quite different from the ordinary General Public License.
       
   157 We use this license for certain libraries in order to permit
       
   158 linking those libraries into non-free programs.</p>
       
   159 
       
   160 <p>When a program is linked with a library, whether statically or
       
   161 using a shared library, the combination of the two is legally
       
   162 speaking a combined work, a derivative of the original library.
       
   163 The ordinary General Public License therefore permits such
       
   164 linking only if the entire combination fits its criteria of
       
   165 freedom. The Lesser General Public License permits more lax
       
   166 criteria for linking other code with the library.</p>
       
   167 
       
   168 <p>We call this license the "Lesser" General Public License
       
   169 because it does Less to protect the user's freedom than the
       
   170 ordinary General Public License. It also provides other free
       
   171 software developers Less of an advantage over competing non-free
       
   172 programs. These disadvantages are the reason we use the ordinary
       
   173 General Public License for many libraries. However, the Lesser
       
   174 license provides advantages in certain special circumstances.</p>
       
   175 
       
   176 <p>For example, on rare occasions, there may be a special need to
       
   177 encourage the widest possible use of a certain library, so that
       
   178 it becomes a de-facto standard. To achieve this, non-free
       
   179 programs must be allowed to use the library. A more frequent case
       
   180 is that a free library does the same job as widely used non-free
       
   181 libraries. In this case, there is little to gain by limiting the
       
   182 free library to free software only, so we use the Lesser General
       
   183 Public License.</p>
       
   184 
       
   185 <p>In other cases, permission to use a particular library in
       
   186 non-free programs enables a greater number of people to use a
       
   187 large body of free software. For example, permission to use the
       
   188 GNU C Library in non-free programs enables many more people to
       
   189 use the whole GNU operating system, as well as its variant, the
       
   190 GNU/Linux operating system.</p>
       
   191 
       
   192 <p>Although the Lesser General Public License is Less protective
       
   193 of the users' freedom, it does ensure that the user of a program
       
   194 that is linked with the Library has the freedom and the
       
   195 wherewithal to run that program using a modified version of the
       
   196 Library.</p>
       
   197 
       
   198 <p>The precise terms and conditions for copying, distribution and
       
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   200 between a "work based on the library" and a "work that uses the
       
   201 library". The former contains code derived from the library,
       
   202 whereas the latter must be combined with the library in order to
       
   203 run.</p>
       
   204 
       
   205 <h2>Terms and conditions for copying, distribution and modification</h2>
       
   206 
       
   207 <p><b>0.</b> This License Agreement applies to any software
       
   208 library or other program which contains a notice placed by the
       
   209 copyright holder or other authorized party saying it may be
       
   210 distributed under the terms of this Lesser General Public License
       
   211 (also called "this License"). Each licensee is addressed as
       
   212 "you".</p>
       
   213 
       
   214 <p>A "library" means a collection of software functions and/or
       
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   219 <p>The "Library", below, refers to any such software library or
       
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   233 
       
   234 <p>Activities other than copying, distribution and modification
       
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   243 <p><b>1.</b> You may copy and distribute verbatim copies of the
       
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   250 
       
   251 <p>You may charge a fee for the physical act of transferring a
       
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   254 
       
   255 <p><b>2.</b> You may modify your copy or copies of the Library or
       
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   261 <ul>
       
   262 <li><b>a)</b> The modified work must itself be a software
       
   263 library.</li>
       
   264 
       
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   267 of any change.</li>
       
   268 
       
   269 <li><b>c)</b> You must cause the whole of the work to be licensed
       
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   271 License.</li>
       
   272 
       
   273 <li><b>d)</b> If a facility in the modified Library refers to a
       
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   275 program that uses the facility, other than as an argument passed
       
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   277 effort to ensure that, in the event an application does not
       
   278 supply such function or table, the facility still operates, and
       
   279 performs whatever part of its purpose remains meaningful. 
       
   280 
       
   281 <p>(For example, a function in a library to compute square roots
       
   282 has a purpose that is entirely well-defined independent of the
       
   283 application. Therefore, Subsection 2d requires that any
       
   284 application-supplied function or table used by this function must
       
   285 be optional: if the application does not supply it, the square
       
   286 root function must still compute square roots.)</p>
       
   287 
       
   288 <p>These requirements apply to the modified work as a whole. If
       
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   299 <p>Thus, it is not the intent of this section to claim rights or
       
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   307 other work under the scope of this License.</p>
       
   308 </li>
       
   309 </ul>
       
   310 
       
   311 <p><b>3.</b> You may opt to apply the terms of the ordinary GNU
       
   312 General Public License instead of this License to a given copy of
       
   313 the Library. To do this, you must alter all the notices that
       
   314 refer to this License, so that they refer to the ordinary GNU
       
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   320 
       
   321 <p>Once this change is made in a given copy, it is irreversible
       
   322 for that copy, so the ordinary GNU General Public License applies
       
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   324 copy.</p>
       
   325 
       
   326 <p>This option is useful when you wish to copy part of the code
       
   327 of the Library into a program that is not a library.</p>
       
   328 
       
   329 <p><b>4.</b> You may copy and distribute the Library (or a
       
   330 portion or derivative of it, under Section 2) in object code or
       
   331 executable form under the terms of Sections 1 and 2 above
       
   332 provided that you accompany it with the complete corresponding
       
   333 machine-readable source code, which must be distributed under the
       
   334 terms of Sections 1 and 2 above on a medium customarily used for
       
   335 software interchange.</p>
       
   336 
       
   337 <p>If distribution of object code is made by offering access to
       
   338 copy from a designated place, then offering equivalent access to
       
   339 copy the source code from the same place satisfies the
       
   340 requirement to distribute the source code, even though third
       
   341 parties are not compelled to copy the source along with the
       
   342 object code.</p>
       
   343 
       
   344 <p><b>5.</b> A program that contains no derivative of any portion
       
   345 of the Library, but is designed to work with the Library by being
       
   346 compiled or linked with it, is called a "work that uses the
       
   347 Library". Such a work, in isolation, is not a derivative work of
       
   348 the Library, and therefore falls outside the scope of this
       
   349 License.</p>
       
   350 
       
   351 <p>However, linking a "work that uses the Library" with the
       
   352 Library creates an executable that is a derivative of the Library
       
   353 (because it contains portions of the Library), rather than a
       
   354 "work that uses the library". The executable is therefore covered
       
   355 by this License. Section 6 states terms for distribution of such
       
   356 executables.</p>
       
   357 
       
   358 <p>When a "work that uses the Library" uses material from a
       
   359 header file that is part of the Library, the object code for the
       
   360 work may be a derivative work of the Library even though the
       
   361 source code is not. Whether this is true is especially
       
   362 significant if the work can be linked without the Library, or if
       
   363 the work is itself a library. The threshold for this to be true
       
   364 is not precisely defined by law.</p>
       
   365 
       
   366 <p>If such an object file uses only numerical parameters, data
       
   367 structure layouts and accessors, and small macros and small
       
   368 inline functions (ten lines or less in length), then the use of
       
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   371 code plus portions of the Library will still fall under Section
       
   372 6.)</p>
       
   373 
       
   374 <p>Otherwise, if the work is a derivative of the Library, you may
       
   375 distribute the object code for the work under the terms of
       
   376 Section 6. Any executables containing that work also fall under
       
   377 Section 6, whether or not they are linked directly with the
       
   378 Library itself.</p>
       
   379 
       
   380 <p><b>6.</b> As an exception to the Sections above, you may also
       
   381 combine or link a "work that uses the Library" with the Library
       
   382 to produce a work containing portions of the Library, and
       
   383 distribute that work under terms of your choice, provided that
       
   384 the terms permit modification of the work for the customer's own
       
   385 use and reverse engineering for debugging such modifications.</p>
       
   386 
       
   387 <p>You must give prominent notice with each copy of the work that
       
   388 the Library is used in it and that the Library and its use are
       
   389 covered by this License. You must supply a copy of this License.
       
   390 If the work during execution displays copyright notices, you must
       
   391 include the copyright notice for the Library among them, as well
       
   392 as a reference directing the user to the copy of this License.
       
   393 Also, you must do one of these things:</p>
       
   394 
       
   395 <ul>
       
   396 <li><b>a)</b> Accompany the work with the complete corresponding
       
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   404 that the user who changes the contents of definitions files in
       
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   407 
       
   408 <li><b>b)</b> Use a suitable shared library mechanism for linking
       
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   410 run time a copy of the library already present on the user's
       
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   416 
       
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   418 at least three years, to give the same user the materials
       
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   427 these materials or that you have already sent this user a
       
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   429 </ul>
       
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   431 <p>For an executable, the required form of the "work that uses
       
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   446 <p><b>7.</b> You may place library facilities that are a work
       
   447 based on the Library side-by-side in a single library together
       
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   493 <p><b>11.</b> If, as a consequence of a court judgment or
       
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   517 which is implemented by public license practices. Many people
       
   518 have made generous contributions to the wide range of software
       
   519 distributed through that system in reliance on consistent
       
   520 application of that system; it is up to the author/donor to
       
   521 decide if he or she is willing to distribute software through any
       
   522 other system and a licensee cannot impose that choice.</p>
       
   523 
       
   524 <p>This section is intended to make thoroughly clear what is
       
   525 believed to be a consequence of the rest of this License.</p>
       
   526 
       
   527 <p><b>12.</b> If the distribution and/or use of the Library is
       
   528 restricted in certain countries either by patents or by
       
   529 copyrighted interfaces, the original copyright holder who places
       
   530 the Library under this License may add an explicit geographical
       
   531 distribution limitation excluding those countries, so that
       
   532 distribution is permitted only in or among countries not thus
       
   533 excluded. In such case, this License incorporates the limitation
       
   534 as if written in the body of this License.</p>
       
   535 
       
   536 <p><b>13.</b> The Free Software Foundation may publish revised
       
   537 and/or new versions of the Lesser General Public License from
       
   538 time to time. Such new versions will be similar in spirit to the
       
   539 present version, but may differ in detail to address new problems
       
   540 or concerns.</p>
       
   541 
       
   542 <p>Each version is given a distinguishing version number. If the
       
   543 Library specifies a version number of this License which applies
       
   544 to it and "any later version", you have the option of following
       
   545 the terms and conditions either of that version or of any later
       
   546 version published by the Free Software Foundation. If the Library
       
   547 does not specify a license version number, you may choose any
       
   548 version ever published by the Free Software Foundation.</p>
       
   549 
       
   550 <p><b>14.</b> If you wish to incorporate parts of the Library
       
   551 into other free programs whose distribution conditions are
       
   552 incompatible with these, write to the author to ask for
       
   553 permission. For software which is copyrighted by the Free
       
   554 Software Foundation, write to the Free Software Foundation; we
       
   555 sometimes make exceptions for this. Our decision will be guided
       
   556 by the two goals of preserving the free status of all derivatives
       
   557 of our free software and of promoting the sharing and reuse of
       
   558 software generally.</p>
       
   559 
       
   560 <p><b>NO WARRANTY</b></p>
       
   561 
       
   562 <p><b>15.</b> BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE,
       
   563 THERE IS NO WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY
       
   564 APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
       
   565 COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE LIBRARY "AS
       
   566 IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
       
   567 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
       
   568 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE
       
   569 RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH
       
   570 YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF
       
   571 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.</p>
       
   572 
       
   573 <p><b>16.</b> IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR
       
   574 AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER
       
   575 PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED
       
   576 ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
       
   577 SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
       
   578 USE OR INABILITY TO USE THE LIBRARY (INCLUDING BUT NOT LIMITED TO
       
   579 LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES
       
   580 SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE LIBRARY TO
       
   581 OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER
       
   582 PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.</p>
       
   583 
       
   584 <h2>END OF TERMS AND CONDITIONS</h2>
       
   585 
       
   586 <h2>How to Apply These Terms to Your New Libraries</h2>
       
   587 
       
   588 <p>If you develop a new library, and you want it to be of the
       
   589 greatest possible use to the public, we recommend making it free
       
   590 software that everyone can redistribute and change. You can do so
       
   591 by permitting redistribution under these terms (or,
       
   592 alternatively, under the terms of the ordinary General Public
       
   593 License).</p>
       
   594 
       
   595 <p>To apply these terms, attach the following notices to the
       
   596 library. It is safest to attach them to the start of each source
       
   597 file to most effectively convey the exclusion of warranty; and
       
   598 each file should have at least the "copyright" line and a pointer
       
   599 to where the full notice is found.</p>
       
   600 
       
   601 <pre>
       
   602 &lt;one line to give the library's name and an idea of what it does.&gt;
       
   603 Copyright (C) &lt;year&gt; &lt;name of author&gt;
       
   604 
       
   605 This library is free software; you can redistribute it and/or
       
   606 modify it under the terms of the GNU Lesser General Public
       
   607 License as published by the Free Software Foundation; either
       
   608 version 2.1 of the License, or (at your option) any later version.
       
   609 
       
   610 This library is distributed in the hope that it will be useful,
       
   611 but WITHOUT ANY WARRANTY; without even the implied warranty of
       
   612 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
   613 Lesser General Public License for more details.
       
   614 
       
   615 You should have received a copy of the GNU Lesser General Public
       
   616 License along with this library; if not, write to the Free Software
       
   617 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
       
   618 </pre>
       
   619 
       
   620 <p>Also add information on how to contact you by electronic and
       
   621 paper mail.</p>
       
   622 
       
   623 <p>You should also get your employer (if you work as a
       
   624 programmer) or your school, if any, to sign a "copyright
       
   625 disclaimer" for the library, if necessary. Here is a sample;
       
   626 alter the names:</p>
       
   627 
       
   628 <pre>
       
   629 Yoyodyne, Inc., hereby disclaims all copyright interest in
       
   630 the library `Frob' (a library for tweaking knobs) written
       
   631 by James Random Hacker.
       
   632 
       
   633 &lt;signature of Ty Coon&gt;, 1 April 1990
       
   634 Ty Coon, President of Vice
       
   635 </pre>
       
   636 
       
   637 <p>That's all there is to it!</p>
       
   638 
       
   639 <!-- END LICENSE TEXT -->
       
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