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   1  
   2  =head1 NAME
   3  
   4  perlgpl - the GNU General Public License, version 2
   5  
   6  =head1 SYNOPSIS
   7  
   8   You can refer to this document in Pod via "L<perlgpl>"
   9   Or you can see this document by entering "perldoc perlgpl"
  10  
  11  =cut
  12  
  13  # Because the following document's language disallows "changing"
  14  # it, we haven't gone thru and prettied it up with =item's or
  15  # anything.  It's good enough the way it is.
  16  
  17  =head1 DESCRIPTION
  18  
  19  This is B<"The GNU General Public License, version 2">.  It's here so
  20  that modules, programs, etc., that want to declare this as their
  21  distribution license, can link to it.
  22  
  23  It is also one of the two licenses Perl allows itself to be
  24  redistributed and/or modified; for the other one, the Perl Artistic
  25  License, see the L<perlartistic>.
  26  
  27  =head1 GNU GENERAL PUBLIC LICENSE
  28  
  29              GNU GENERAL PUBLIC LICENSE
  30                 Version 2, June 1991
  31  
  32   Copyright (C) 1989, 1991 Free Software Foundation, Inc.
  33                         51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  34   Everyone is permitted to copy and distribute verbatim copies
  35   of this license document, but changing it is not allowed.
  36  
  37                  Preamble
  38  
  39    The licenses for most software are designed to take away your
  40  freedom to share and change it.  By contrast, the GNU General Public
  41  License is intended to guarantee your freedom to share and change free
  42  software--to make sure the software is free for all its users.  This
  43  General Public License applies to most of the Free Software
  44  Foundation's software and to any other program whose authors commit to
  45  using it.  (Some other Free Software Foundation software is covered by
  46  the GNU Library General Public License instead.)  You can apply it to
  47  your programs, too.
  48  
  49    When we speak of free software, we are referring to freedom, not
  50  price.  Our General Public Licenses are designed to make sure that you
  51  have the freedom to distribute copies of free software (and charge for
  52  this service if you wish), that you receive source code or can get it
  53  if you want it, that you can change the software or use pieces of it
  54  in new free programs; and that you know you can do these things.
  55  
  56    To protect your rights, we need to make restrictions that forbid
  57  anyone to deny you these rights or to ask you to surrender the rights.
  58  These restrictions translate to certain responsibilities for you if you
  59  distribute copies of the software, or if you modify it.
  60  
  61    For example, if you distribute copies of such a program, whether
  62  gratis or for a fee, you must give the recipients all the rights that
  63  you have.  You must make sure that they, too, receive or can get the
  64  source code.  And you must show them these terms so they know their
  65  rights.
  66  
  67    We protect your rights with two steps: (1) copyright the software, and
  68  (2) offer you this license which gives you legal permission to copy,
  69  distribute and/or modify the software.
  70  
  71    Also, for each author's protection and ours, we want to make certain
  72  that everyone understands that there is no warranty for this free
  73  software.  If the software is modified by someone else and passed on, we
  74  want its recipients to know that what they have is not the original, so
  75  that any problems introduced by others will not reflect on the original
  76  authors' reputations.
  77  
  78    Finally, any free program is threatened constantly by software
  79  patents.  We wish to avoid the danger that redistributors of a free
  80  program will individually obtain patent licenses, in effect making the
  81  program proprietary.  To prevent this, we have made it clear that any
  82  patent must be licensed for everyone's free use or not licensed at all.
  83  
  84    The precise terms and conditions for copying, distribution and
  85  modification follow.
  86  
  87              GNU GENERAL PUBLIC LICENSE
  88     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  89  
  90    0. This License applies to any program or other work which contains
  91  a notice placed by the copyright holder saying it may be distributed
  92  under the terms of this General Public License.  The "Program", below,
  93  refers to any such program or work, and a "work based on the Program"
  94  means either the Program or any derivative work under copyright law:
  95  that is to say, a work containing the Program or a portion of it,
  96  either verbatim or with modifications and/or translated into another
  97  language.  (Hereinafter, translation is included without limitation in
  98  the term "modification".)  Each licensee is addressed as "you".
  99  
 100  Activities other than copying, distribution and modification are not
 101  covered by this License; they are outside its scope.  The act of
 102  running the Program is not restricted, and the output from the Program
 103  is covered only if its contents constitute a work based on the
 104  Program (independent of having been made by running the Program).
 105  Whether that is true depends on what the Program does.
 106  
 107    1. You may copy and distribute verbatim copies of the Program's
 108  source code as you receive it, in any medium, provided that you
 109  conspicuously and appropriately publish on each copy an appropriate
 110  copyright notice and disclaimer of warranty; keep intact all the
 111  notices that refer to this License and to the absence of any warranty;
 112  and give any other recipients of the Program a copy of this License
 113  along with the Program.
 114  
 115  You may charge a fee for the physical act of transferring a copy, and
 116  you may at your option offer warranty protection in exchange for a fee.
 117  
 118    2. You may modify your copy or copies of the Program or any portion
 119  of it, thus forming a work based on the Program, and copy and
 120  distribute such modifications or work under the terms of Section 1
 121  above, provided that you also meet all of these conditions:
 122  
 123      a) You must cause the modified files to carry prominent notices
 124      stating that you changed the files and the date of any change.
 125  
 126      b) You must cause any work that you distribute or publish, that in
 127      whole or in part contains or is derived from the Program or any
 128      part thereof, to be licensed as a whole at no charge to all third
 129      parties under the terms of this License.
 130  
 131      c) If the modified program normally reads commands interactively
 132      when run, you must cause it, when started running for such
 133      interactive use in the most ordinary way, to print or display an
 134      announcement including an appropriate copyright notice and a
 135      notice that there is no warranty (or else, saying that you provide
 136      a warranty) and that users may redistribute the program under
 137      these conditions, and telling the user how to view a copy of this
 138      License.  (Exception: if the Program itself is interactive but
 139      does not normally print such an announcement, your work based on
 140      the Program is not required to print an announcement.)
 141  
 142  These requirements apply to the modified work as a whole.  If
 143  identifiable sections of that work are not derived from the Program,
 144  and can be reasonably considered independent and separate works in
 145  themselves, then this License, and its terms, do not apply to those
 146  sections when you distribute them as separate works.  But when you
 147  distribute the same sections as part of a whole which is a work based
 148  on the Program, the distribution of the whole must be on the terms of
 149  this License, whose permissions for other licensees extend to the
 150  entire whole, and thus to each and every part regardless of who wrote it.
 151  
 152  Thus, it is not the intent of this section to claim rights or contest
 153  your rights to work written entirely by you; rather, the intent is to
 154  exercise the right to control the distribution of derivative or
 155  collective works based on the Program.
 156  
 157  In addition, mere aggregation of another work not based on the Program
 158  with the Program (or with a work based on the Program) on a volume of
 159  a storage or distribution medium does not bring the other work under
 160  the scope of this License.
 161  
 162    3. You may copy and distribute the Program (or a work based on it,
 163  under Section 2) in object code or executable form under the terms of
 164  Sections 1 and 2 above provided that you also do one of the following:
 165  
 166      a) Accompany it with the complete corresponding machine-readable
 167      source code, which must be distributed under the terms of Sections
 168      1 and 2 above on a medium customarily used for software
 169      interchange; or,
 170  
 171      b) Accompany it with a written offer, valid for at least three
 172      years, to give any third party, for a charge no more than your
 173      cost of physically performing source distribution, a complete
 174      machine-readable copy of the corresponding source code, to be
 175      distributed under the terms of Sections 1 and 2 above on a medium
 176      customarily used for software interchange; or,
 177  
 178      c) Accompany it with the information you received as to the offer
 179      to distribute corresponding source code.  (This alternative is
 180      allowed only for noncommercial distribution and only if you
 181      received the program in object code or executable form with such
 182      an offer, in accord with Subsection b above.)
 183  
 184  The source code for a work means the preferred form of the work for
 185  making modifications to it.  For an executable work, complete source
 186  code means all the source code for all modules it contains, plus any
 187  associated interface definition files, plus the scripts used to
 188  control compilation and installation of the executable.  However, as a
 189  special exception, the source code distributed need not include
 190  anything that is normally distributed (in either source or binary
 191  form) with the major components (compiler, kernel, and so on) of the
 192  operating system on which the executable runs, unless that component
 193  itself accompanies the executable.
 194  
 195  If distribution of executable or object code is made by offering
 196  access to copy from a designated place, then offering equivalent
 197  access to copy the source code from the same place counts as
 198  distribution of the source code, even though third parties are not
 199  compelled to copy the source along with the object code.
 200  
 201    4. You may not copy, modify, sublicense, or distribute the Program
 202  except as expressly provided under this License.  Any attempt
 203  otherwise to copy, modify, sublicense or distribute the Program is
 204  void, and will automatically terminate your rights under this License.
 205  However, parties who have received copies, or rights, from you under
 206  this License will not have their licenses terminated so long as such
 207  parties remain in full compliance.
 208  
 209    5. You are not required to accept this License, since you have not
 210  signed it.  However, nothing else grants you permission to modify or
 211  distribute the Program or its derivative works.  These actions are
 212  prohibited by law if you do not accept this License.  Therefore, by
 213  modifying or distributing the Program (or any work based on the
 214  Program), you indicate your acceptance of this License to do so, and
 215  all its terms and conditions for copying, distributing or modifying
 216  the Program or works based on it.
 217  
 218    6. Each time you redistribute the Program (or any work based on the
 219  Program), the recipient automatically receives a license from the
 220  original licensor to copy, distribute or modify the Program subject to
 221  these terms and conditions.  You may not impose any further
 222  restrictions on the recipients' exercise of the rights granted herein.
 223  You are not responsible for enforcing compliance by third parties to
 224  this License.
 225  
 226    7. If, as a consequence of a court judgment or allegation of patent
 227  infringement or for any other reason (not limited to patent issues),
 228  conditions are imposed on you (whether by court order, agreement or
 229  otherwise) that contradict the conditions of this License, they do not
 230  excuse you from the conditions of this License.  If you cannot
 231  distribute so as to satisfy simultaneously your obligations under this
 232  License and any other pertinent obligations, then as a consequence you
 233  may not distribute the Program at all.  For example, if a patent
 234  license would not permit royalty-free redistribution of the Program by
 235  all those who receive copies directly or indirectly through you, then
 236  the only way you could satisfy both it and this License would be to
 237  refrain entirely from distribution of the Program.
 238  
 239  If any portion of this section is held invalid or unenforceable under
 240  any particular circumstance, the balance of the section is intended to
 241  apply and the section as a whole is intended to apply in other
 242  circumstances.
 243  
 244  It is not the purpose of this section to induce you to infringe any
 245  patents or other property right claims or to contest validity of any
 246  such claims; this section has the sole purpose of protecting the
 247  integrity of the free software distribution system, which is
 248  implemented by public license practices.  Many people have made
 249  generous contributions to the wide range of software distributed
 250  through that system in reliance on consistent application of that
 251  system; it is up to the author/donor to decide if he or she is willing
 252  to distribute software through any other system and a licensee cannot
 253  impose that choice.
 254  
 255  This section is intended to make thoroughly clear what is believed to
 256  be a consequence of the rest of this License.
 257  
 258    8. If the distribution and/or use of the Program is restricted in
 259  certain countries either by patents or by copyrighted interfaces, the
 260  original copyright holder who places the Program under this License
 261  may add an explicit geographical distribution limitation excluding
 262  those countries, so that distribution is permitted only in or among
 263  countries not thus excluded.  In such case, this License incorporates
 264  the limitation as if written in the body of this License.
 265  
 266    9. The Free Software Foundation may publish revised and/or new versions
 267  of the General Public License from time to time.  Such new versions will
 268  be similar in spirit to the present version, but may differ in detail to
 269  address new problems or concerns.
 270  
 271  Each version is given a distinguishing version number.  If the Program
 272  specifies a version number of this License which applies to it and
 273  "any later version", you have the option of following the terms and
 274  conditions either of that version or of any later version published by
 275  the Free Software Foundation.  If the Program does not specify a
 276  version number of this License, you may choose any version ever
 277  published by the Free Software Foundation.
 278  
 279    10. If you wish to incorporate parts of the Program into other free
 280  programs whose distribution conditions are different, write to the author
 281  to ask for permission.  For software which is copyrighted by the Free
 282  Software Foundation, write to the Free Software Foundation; we sometimes
 283  make exceptions for this.  Our decision will be guided by the two goals
 284  of preserving the free status of all derivatives of our free software and
 285  of promoting the sharing and reuse of software generally.
 286  
 287                  NO WARRANTY
 288  
 289    11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
 290  WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
 291  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
 292  OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY
 293  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
 294  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 295  PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
 296  PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 297  THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 298  
 299    12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
 300  WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
 301  AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
 302  FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
 303  CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
 304  PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
 305  RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
 306  FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF
 307  SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 308  DAMAGES.
 309  
 310               END OF TERMS AND CONDITIONS
 311  
 312          How to Apply These Terms to Your New Programs
 313  
 314    If you develop a new program, and you want it to be of the greatest
 315  possible use to the public, the best way to achieve this is to make it
 316  free software which everyone can redistribute and change under these
 317  terms.
 318  
 319    To do so, attach the following notices to the program.  It is safest
 320  to attach them to the start of each source file to most effectively
 321  convey the exclusion of warranty; and each file should have at least
 322  the "copyright" line and a pointer to where the full notice is found.
 323  
 324      <one line to give the program's name and a brief idea of what it does.>
 325      Copyright (C) <year>  <name of author>
 326  
 327      This program is free software; you can redistribute it and/or modify
 328      it under the terms of the GNU General Public License as published by
 329      the Free Software Foundation; either version 2 of the License, or
 330      (at your option) any later version.
 331  
 332      This program is distributed in the hope that it will be useful,
 333      but WITHOUT ANY WARRANTY; without even the implied warranty of
 334      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 335      GNU General Public License for more details.
 336  
 337      You should have received a copy of the GNU General Public License
 338      along with this program; if not, write to the Free Software
 339      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 340  
 341  
 342  Also add information on how to contact you by electronic and paper mail.
 343  
 344  If the program is interactive, make it output a short notice like this
 345  when it starts in an interactive mode:
 346  
 347      Gnomovision version 69, Copyright (C) year name of author
 348      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
 349      This is free software, and you are welcome to redistribute it
 350      under certain conditions; type `show c' for details.
 351  
 352  The hypothetical commands `show w' and `show c' should show the appropriate
 353  parts of the General Public License.  Of course, the commands you use may
 354  be called something other than `show w' and `show c'; they could even be
 355  mouse-clicks or menu items--whatever suits your program.
 356  
 357  You should also get your employer (if you work as a programmer) or your
 358  school, if any, to sign a "copyright disclaimer" for the program, if
 359  necessary.  Here is a sample; alter the names:
 360  
 361    Yoyodyne, Inc., hereby disclaims all copyright interest in the program
 362    `Gnomovision' (which makes passes at compilers) written by James Hacker.
 363  
 364    <signature of Ty Coon>, 1 April 1989
 365    Ty Coon, President of Vice
 366  
 367  This General Public License does not permit incorporating your program into
 368  proprietary programs.  If your program is a subroutine library, you may
 369  consider it more useful to permit linking proprietary applications with the
 370  library.  If this is what you want to do, use the GNU Library General
 371  Public License instead of this License.
 372  
 373  
 374  [End.]
 375  
 376  =cut
 377  
 378