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    1 
    2 *********************************************************************
    3   As a special exception, you have permission to link this program
    4   with the CGAL library and distribute executables, as long as you
    5   follow the requirements of the GNU GPL in regard to all of the
    6   software in the executable aside from CGAL.
    7 *********************************************************************
    8 
    9 		    GNU GENERAL PUBLIC LICENSE
   10 		       Version 2, June 1991
   11 
   12  Copyright (C) 1989, 1991 Free Software Foundation, Inc.
   13      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   14  Everyone is permitted to copy and distribute verbatim copies
   15  of this license document, but changing it is not allowed.
   16 
   17 			    Preamble
   18 
   19   The licenses for most software are designed to take away your
   20 freedom to share and change it.  By contrast, the GNU General Public
   21 License is intended to guarantee your freedom to share and change free
   22 software--to make sure the software is free for all its users.  This
   23 General Public License applies to most of the Free Software
   24 Foundation's software and to any other program whose authors commit to
   25 using it.  (Some other Free Software Foundation software is covered by
   26 the GNU Library General Public License instead.)  You can apply it to
   27 your programs, too.
   28 
   29   When we speak of free software, we are referring to freedom, not
   30 price.  Our General Public Licenses are designed to make sure that you
   31 have the freedom to distribute copies of free software (and charge for
   32 this service if you wish), that you receive source code or can get it
   33 if you want it, that you can change the software or use pieces of it
   34 in new free programs; and that you know you can do these things.
   35 
   36   To protect your rights, we need to make restrictions that forbid
   37 anyone to deny you these rights or to ask you to surrender the rights.
   38 These restrictions translate to certain responsibilities for you if you
   39 distribute copies of the software, or if you modify it.
   40 
   41   For example, if you distribute copies of such a program, whether
   42 gratis or for a fee, you must give the recipients all the rights that
   43 you have.  You must make sure that they, too, receive or can get the
   44 source code.  And you must show them these terms so they know their
   45 rights.
   46 
   47   We protect your rights with two steps: (1) copyright the software, and
   48 (2) offer you this license which gives you legal permission to copy,
   49 distribute and/or modify the software.
   50 
   51   Also, for each author's protection and ours, we want to make certain
   52 that everyone understands that there is no warranty for this free
   53 software.  If the software is modified by someone else and passed on, we
   54 want its recipients to know that what they have is not the original, so
   55 that any problems introduced by others will not reflect on the original
   56 authors' reputations.
   57 
   58   Finally, any free program is threatened constantly by software
   59 patents.  We wish to avoid the danger that redistributors of a free
   60 program will individually obtain patent licenses, in effect making the
   61 program proprietary.  To prevent this, we have made it clear that any
   62 patent must be licensed for everyone's free use or not licensed at all.
   63 
   64   The precise terms and conditions for copying, distribution and
   65 modification follow.
   66 
   67 		    GNU GENERAL PUBLIC LICENSE
   68    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   69 
   70   0. This License applies to any program or other work which contains
   71 a notice placed by the copyright holder saying it may be distributed
   72 under the terms of this General Public License.  The "Program", below,
   73 refers to any such program or work, and a "work based on the Program"
   74 means either the Program or any derivative work under copyright law:
   75 that is to say, a work containing the Program or a portion of it,
   76 either verbatim or with modifications and/or translated into another
   77 language.  (Hereinafter, translation is included without limitation in
   78 the term "modification".)  Each licensee is addressed as "you".
   79 
   80 Activities other than copying, distribution and modification are not
   81 covered by this License; they are outside its scope.  The act of
   82 running the Program is not restricted, and the output from the Program
   83 is covered only if its contents constitute a work based on the
   84 Program (independent of having been made by running the Program).
   85 Whether that is true depends on what the Program does.
   86 
   87   1. You may copy and distribute verbatim copies of the Program's
   88 source code as you receive it, in any medium, provided that you
   89 conspicuously and appropriately publish on each copy an appropriate
   90 copyright notice and disclaimer of warranty; keep intact all the
   91 notices that refer to this License and to the absence of any warranty;
   92 and give any other recipients of the Program a copy of this License
   93 along with the Program.
   94 
   95 You may charge a fee for the physical act of transferring a copy, and
   96 you may at your option offer warranty protection in exchange for a fee.
   97 
   98   2. You may modify your copy or copies of the Program or any portion
   99 of it, thus forming a work based on the Program, and copy and
  100 distribute such modifications or work under the terms of Section 1
  101 above, provided that you also meet all of these conditions:
  102 
  103     a) You must cause the modified files to carry prominent notices
  104     stating that you changed the files and the date of any change.
  105 
  106     b) You must cause any work that you distribute or publish, that in
  107     whole or in part contains or is derived from the Program or any
  108     part thereof, to be licensed as a whole at no charge to all third
  109     parties under the terms of this License.
  110 
  111     c) If the modified program normally reads commands interactively
  112     when run, you must cause it, when started running for such
  113     interactive use in the most ordinary way, to print or display an
  114     announcement including an appropriate copyright notice and a
  115     notice that there is no warranty (or else, saying that you provide
  116     a warranty) and that users may redistribute the program under
  117     these conditions, and telling the user how to view a copy of this
  118     License.  (Exception: if the Program itself is interactive but
  119     does not normally print such an announcement, your work based on
  120     the Program is not required to print an announcement.)
  121 
  122 These requirements apply to the modified work as a whole.  If
  123 identifiable sections of that work are not derived from the Program,
  124 and can be reasonably considered independent and separate works in
  125 themselves, then this License, and its terms, do not apply to those
  126 sections when you distribute them as separate works.  But when you
  127 distribute the same sections as part of a whole which is a work based
  128 on the Program, the distribution of the whole must be on the terms of
  129 this License, whose permissions for other licensees extend to the
  130 entire whole, and thus to each and every part regardless of who wrote it.
  131 
  132 Thus, it is not the intent of this section to claim rights or contest
  133 your rights to work written entirely by you; rather, the intent is to
  134 exercise the right to control the distribution of derivative or
  135 collective works based on the Program.
  136 
  137 In addition, mere aggregation of another work not based on the Program
  138 with the Program (or with a work based on the Program) on a volume of
  139 a storage or distribution medium does not bring the other work under
  140 the scope of this License.
  141 
  142   3. You may copy and distribute the Program (or a work based on it,
  143 under Section 2) in object code or executable form under the terms of
  144 Sections 1 and 2 above provided that you also do one of the following:
  145 
  146     a) Accompany it with the complete corresponding machine-readable
  147     source code, which must be distributed under the terms of Sections
  148     1 and 2 above on a medium customarily used for software interchange; or,
  149 
  150     b) Accompany it with a written offer, valid for at least three
  151     years, to give any third party, for a charge no more than your
  152     cost of physically performing source distribution, a complete
  153     machine-readable copy of the corresponding source code, to be
  154     distributed under the terms of Sections 1 and 2 above on a medium
  155     customarily used for software interchange; or,
  156 
  157     c) Accompany it with the information you received as to the offer
  158     to distribute corresponding source code.  (This alternative is
  159     allowed only for noncommercial distribution and only if you
  160     received the program in object code or executable form with such
  161     an offer, in accord with Subsection b above.)
  162 
  163 The source code for a work means the preferred form of the work for
  164 making modifications to it.  For an executable work, complete source
  165 code means all the source code for all modules it contains, plus any
  166 associated interface definition files, plus the scripts used to
  167 control compilation and installation of the executable.  However, as a
  168 special exception, the source code distributed need not include
  169 anything that is normally distributed (in either source or binary
  170 form) with the major components (compiler, kernel, and so on) of the
  171 operating system on which the executable runs, unless that component
  172 itself accompanies the executable.
  173 
  174 If distribution of executable or object code is made by offering
  175 access to copy from a designated place, then offering equivalent
  176 access to copy the source code from the same place counts as
  177 distribution of the source code, even though third parties are not
  178 compelled to copy the source along with the object code.
  179 
  180   4. You may not copy, modify, sublicense, or distribute the Program
  181 except as expressly provided under this License.  Any attempt
  182 otherwise to copy, modify, sublicense or distribute the Program is
  183 void, and will automatically terminate your rights under this License.
  184 However, parties who have received copies, or rights, from you under
  185 this License will not have their licenses terminated so long as such
  186 parties remain in full compliance.
  187 
  188   5. You are not required to accept this License, since you have not
  189 signed it.  However, nothing else grants you permission to modify or
  190 distribute the Program or its derivative works.  These actions are
  191 prohibited by law if you do not accept this License.  Therefore, by
  192 modifying or distributing the Program (or any work based on the
  193 Program), you indicate your acceptance of this License to do so, and
  194 all its terms and conditions for copying, distributing or modifying
  195 the Program or works based on it.
  196 
  197   6. Each time you redistribute the Program (or any work based on the
  198 Program), the recipient automatically receives a license from the
  199 original licensor to copy, distribute or modify the Program subject to
  200 these terms and conditions.  You may not impose any further
  201 restrictions on the recipients' exercise of the rights granted herein.
  202 You are not responsible for enforcing compliance by third parties to
  203 this License.
  204 
  205   7. If, as a consequence of a court judgment or allegation of patent
  206 infringement or for any other reason (not limited to patent issues),
  207 conditions are imposed on you (whether by court order, agreement or
  208 otherwise) that contradict the conditions of this License, they do not
  209 excuse you from the conditions of this License.  If you cannot
  210 distribute so as to satisfy simultaneously your obligations under this
  211 License and any other pertinent obligations, then as a consequence you
  212 may not distribute the Program at all.  For example, if a patent
  213 license would not permit royalty-free redistribution of the Program by
  214 all those who receive copies directly or indirectly through you, then
  215 the only way you could satisfy both it and this License would be to
  216 refrain entirely from distribution of the Program.
  217 
  218 If any portion of this section is held invalid or unenforceable under
  219 any particular circumstance, the balance of the section is intended to
  220 apply and the section as a whole is intended to apply in other
  221 circumstances.
  222 
  223 It is not the purpose of this section to induce you to infringe any
  224 patents or other property right claims or to contest validity of any
  225 such claims; this section has the sole purpose of protecting the
  226 integrity of the free software distribution system, which is
  227 implemented by public license practices.  Many people have made
  228 generous contributions to the wide range of software distributed
  229 through that system in reliance on consistent application of that
  230 system; it is up to the author/donor to decide if he or she is willing
  231 to distribute software through any other system and a licensee cannot
  232 impose that choice.
  233 
  234 This section is intended to make thoroughly clear what is believed to
  235 be a consequence of the rest of this License.
  236 
  237   8. If the distribution and/or use of the Program is restricted in
  238 certain countries either by patents or by copyrighted interfaces, the
  239 original copyright holder who places the Program under this License
  240 may add an explicit geographical distribution limitation excluding
  241 those countries, so that distribution is permitted only in or among
  242 countries not thus excluded.  In such case, this License incorporates
  243 the limitation as if written in the body of this License.
  244 
  245   9. The Free Software Foundation may publish revised and/or new versions
  246 of the General Public License from time to time.  Such new versions will
  247 be similar in spirit to the present version, but may differ in detail to
  248 address new problems or concerns.
  249 
  250 Each version is given a distinguishing version number.  If the Program
  251 specifies a version number of this License which applies to it and "any
  252 later version", you have the option of following the terms and conditions
  253 either of that version or of any later version published by the Free
  254 Software Foundation.  If the Program does not specify a version number of
  255 this License, you may choose any version ever published by the Free Software
  256 Foundation.
  257 
  258   10. If you wish to incorporate parts of the Program into other free
  259 programs whose distribution conditions are different, write to the author
  260 to ask for permission.  For software which is copyrighted by the Free
  261 Software Foundation, write to the Free Software Foundation; we sometimes
  262 make exceptions for this.  Our decision will be guided by the two goals
  263 of preserving the free status of all derivatives of our free software and
  264 of promoting the sharing and reuse of software generally.
  265 
  266 			    NO WARRANTY
  267 
  268   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  269 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  270 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  271 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  272 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  273 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  274 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  275 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  276 REPAIR OR CORRECTION.
  277 
  278   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  279 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  280 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  281 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  282 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  283 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  284 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  285 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  286 POSSIBILITY OF SUCH DAMAGES.
  287 
  288 		     END OF TERMS AND CONDITIONS
  289 
  290 	    How to Apply These Terms to Your New Programs
  291 
  292   If you develop a new program, and you want it to be of the greatest
  293 possible use to the public, the best way to achieve this is to make it
  294 free software which everyone can redistribute and change under these terms.
  295 
  296   To do so, attach the following notices to the program.  It is safest
  297 to attach them to the start of each source file to most effectively
  298 convey the exclusion of warranty; and each file should have at least
  299 the "copyright" line and a pointer to where the full notice is found.
  300 
  301     <one line to give the program's name and a brief idea of what it does.>
  302     Copyright (C) <year>  <name of author>
  303 
  304     This program is free software; you can redistribute it and/or modify
  305     it under the terms of the GNU General Public License as published by
  306     the Free Software Foundation; either version 2 of the License, or
  307     (at your option) any later version.
  308 
  309     This program is distributed in the hope that it will be useful,
  310     but WITHOUT ANY WARRANTY; without even the implied warranty of
  311     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  312     GNU General Public License for more details.
  313 
  314     You should have received a copy of the GNU General Public License
  315     along with this program; if not, write to the Free Software
  316     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  317 
  318 
  319 Also add information on how to contact you by electronic and paper mail.
  320 
  321 If the program is interactive, make it output a short notice like this
  322 when it starts in an interactive mode:
  323 
  324     Gnomovision version 69, Copyright (C) year  name of author
  325     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  326     This is free software, and you are welcome to redistribute it
  327     under certain conditions; type `show c' for details.
  328 
  329 The hypothetical commands `show w' and `show c' should show the appropriate
  330 parts of the General Public License.  Of course, the commands you use may
  331 be called something other than `show w' and `show c'; they could even be
  332 mouse-clicks or menu items--whatever suits your program.
  333 
  334 You should also get your employer (if you work as a programmer) or your
  335 school, if any, to sign a "copyright disclaimer" for the program, if
  336 necessary.  Here is a sample; alter the names:
  337 
  338   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  339   `Gnomovision' (which makes passes at compilers) written by James Hacker.
  340 
  341   <signature of Ty Coon>, 1 April 1989
  342   Ty Coon, President of Vice
  343 
  344 This General Public License does not permit incorporating your program into
  345 proprietary programs.  If your program is a subroutine library, you may
  346 consider it more useful to permit linking proprietary applications with the
  347 library.  If this is what you want to do, use the GNU Library General
  348 Public License instead of this License.