General Public License, version 2

This is the license under which a diminishing fraction of the source code of Praat is distributed (see Acknowledgments).

`GNU GENERAL PUBLIC LICENSE
` `
` `Version 2, June 1991
` `
` `Copyright (C) 1989, 1991 Free Software Foundation, Inc.
` `51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
` `
` `Everyone is permitted to copy and distribute verbatim copies
` `of this license document, but changing it is not allowed.
` `
` `Preamble
` `
` `The licenses for most software are designed to take away your freedom to share and change it. By contrast, the
` `GNU General Public License is intended to guarantee your freedom to share and change free software--to make
` `sure the software is free for all its users. This General Public License applies to most of the Free Software
` `Foundation's software and to any other program whose authors commit to using it. (Some other Free Software
` `Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your
` `programs, too.
` `
` `When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed
` `to make sure that you have the freedom to distribute copies of free software (and charge for this service if you
` `wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it
` `in new free programs; and that you know you can do these things.
` `
` `To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to
` `surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the
` `software, or if you modify it.
` `
` `For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients
` `all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must
` `show them these terms so they know their rights.
` `
` `We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you
` `legal permission to copy, distribute and/or modify the software.
` `
` `Also, for each author's protection and ours, we want to make certain that everyone understands that there is no
` `warranty for this free software. If the software is modified by someone else and passed on, we want its recipients
` `to know that what they have is not the original, so that any problems introduced by others will not reflect on the
` `original authors' reputations.
` `
` `Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that
` `redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary.
` `To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at
` `all.
` `
` `The precise terms and conditions for copying, distribution and modification follow.
` `
` `TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
` `MODIFICATION
` `
` `0. This License applies to any program or other work which contains a notice placed by the copyright holder
` `saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any
` `such program or work, and a "work based on the Program" means either the Program or any derivative work
` `under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with
` `modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the
` `term "modification".) Each licensee is addressed as "you".
` `
` `Activities other than copying, distribution and modification are not covered by this License; they are outside its
` `scope. The act of running the Program is not restricted, and the output from the Program is covered only if its
` `contents constitute a work based on the Program (independent of having been made by running the Program).
` `Whether that is true depends on what the Program does.
` `
` `1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium,
` `provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and
` `disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and
` `give any other recipients of the Program a copy of this License along with the Program.
` `
` `You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty
` `protection in exchange for a fee.
` `
` `2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the
` `Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that
` `you also meet all of these conditions:
` `
` `a) You must cause the modified files to carry prominent notices stating that you changed the files and the
` `date of any change.
` `
` `b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived
` `from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the
` `terms of this License.
` `
` `c) If the modified program normally reads commands interactively when run, you must cause it, when
` `started running for such interactive use in the most ordinary way, to print or display an announcement
` `including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you
` `provide a warranty) and that users may redistribute the program under these conditions, and telling the
` `user how to view a copy of this License. (Exception: if the Program itself is interactive but does not
` `normally print such an announcement, your work based on the Program is not required to print an
` `announcement.)
` `
` `These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived
` `from the Program, and can be reasonably considered independent and separate works in themselves, then this
` `License, and its terms, do not apply to those sections when you distribute them as separate works. But when you
` `distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole
` `must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to
` `each and every part regardless of who wrote it.
` `
` `Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you;
` `rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the
` `Program.
` `
` `In addition, mere aggregation of another work not based on the Program with the Program (or with a work based
` `on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope
` `of this License.
` `
` `3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable
` `form under the terms of Sections 1 and 2 above provided that you also do one of the following:
` `
` `a) Accompany it with the complete corresponding machine-readable source code, which must be
` `distributed under the terms of Sections 1 and 2 above on a medium customarily used for software
` `interchange; or,
` `
` `b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no
` `more than your cost of physically performing source distribution, a complete machine-readable copy of the
` `corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium
` `customarily used for software interchange; or,
` `
` `c) Accompany it with the information you received as to the offer to distribute corresponding source code.
` `(This alternative is allowed only for noncommercial distribution and only if you received the program in
` `object code or executable form with such an offer, in accord with Subsection b above.)
` `
` `The source code for a work means the preferred form of the work for making modifications to it. For an
` `executable work, complete source code means all the source code for all modules it contains, plus any associated
` `interface definition files, plus the scripts used to control compilation and installation of the executable. However, as
` `a special exception, the source code distributed need not include anything that is normally distributed (in either
` `source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which
` `the executable runs, unless that component itself accompanies the executable.
` `
` `If distribution of executable or object code is made by offering access to copy from a designated place, then
` `offering equivalent access to copy the source code from the same place counts as distribution of the source code,
` `even though third parties are not compelled to copy the source along with the object code.
` `
` `4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this
` `License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will
` `automatically terminate your rights under this License. However, parties who have received copies, or rights, from
` `you under this License will not have their licenses terminated so long as such parties remain in full compliance.
` `
` `5. You are not required to accept this License, since you have not signed it. However, nothing else grants you
` `permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you
` `do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the
` `Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying,
` `distributing or modifying the Program or works based on it.
` `
` `6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically
` `receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and
` `conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein.
` `You are not responsible for enforcing compliance by third parties to this License.
` `
` `7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not
` `limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that
` `contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot
` `distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations,
` `then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit
` `royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then
` `the only way you could satisfy both it and this License would be to refrain entirely from distribution of the
` `Program.
` `
` `If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the
` `section is intended to apply and the section as a whole is intended to apply in other circumstances.
` `
` `It is not the purpose of this section to induce you to infringe any patents or other property right claims or to
` `contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software
` `distribution system, which is implemented by public license practices. Many people have made generous
` `contributions to the wide range of software distributed through that system in reliance on consistent application of
` `that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other
` `system and a licensee cannot impose that choice.
` `
` `This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License.
` `
` `8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted
` `interfaces, the original copyright holder who places the Program under this License may add an explicit
` `geographical distribution limitation excluding those countries, so that distribution is permitted only in or among
` `countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this
` `License.
` `
` `9. The Free Software Foundation may publish revised and/or new versions of the General Public License from
` `time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address
` `new problems or concerns.
` `
` `Each version is given a distinguishing version number. If the Program specifies a version number of this License
` `which applies to it and "any later version", you have the option of following the terms and conditions either of that
` `version or of any later version published by the Free Software Foundation. If the Program does not specify a
` `version number of this License, you may choose any version ever published by the Free Software Foundation.
` `
` `10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are
` `different, write to the author to ask for permission. For software which is copyrighted by the Free Software
` `Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be
` `guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the
` `sharing and reuse of software generally.
` `
` `NO WARRANTY
` `
` `11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE
` `PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
` `STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE
` `PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
` `INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
` `FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
` `PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE,
` `YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
` `
` `12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL
` `ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE
` `THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
` `GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
` `INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
` `BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
` `FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH
` `HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
` `
` `END OF TERMS AND CONDITIONS
` `
` `How to Apply These Terms to Your New Programs
` `
` `If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to
` `achieve this is to make it free software which everyone can redistribute and change under these terms.
` `
` `To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to
` `most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a
` `pointer to where the full notice is found.
` `
` `one line to give the program's name and an idea of what it does.
` `Copyright (C) yyyy name of author
` `
` `This program is free software; you can redistribute it and/or
` `modify it under the terms of the GNU General Public License
` `as published by the Free Software Foundation; either version 2
` `of the License, or (at your option) any later version.
` `
` `This program is distributed in the hope that it will be useful,
` `but WITHOUT ANY WARRANTY; without even the implied warranty of
` `MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
` `GNU General Public License for more details.
` `
` `You should have received a copy of the GNU General Public License
` `along with this program; if not, write to the Free Software
` `Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
` `
` `Also add information on how to contact you by electronic and paper mail.
` `
` `If the program is interactive, make it output a short notice like this when it starts in an interactive mode:
` `
` `Gnomovision version 69, Copyright (C) year name of author
` `Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
` `type `show w'. This is free software, and you are welcome
` `to redistribute it under certain conditions; type `show c'
` `for details.
` `
` `The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public
` `License. Of course, the commands you use may be called something other than `show w' and `show c'; they could
` `even be mouse-clicks or menu items--whatever suits your program.
` `
` `You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright
` `disclaimer" for the program, if necessary. Here is a sample; alter the names:
` `
` `Yoyodyne, Inc., hereby disclaims all copyright
` `interest in the program `Gnomovision'
` `(which makes passes at compilers) written
` `by James Hacker.
` `
` `signature of Ty Coon, 1 April 1989
` `Ty Coon, President of Vice
` `
` `This General Public License does not permit incorporating your program into proprietary programs. If your
` `program is a subroutine library, you may consider it more useful to permit linking proprietary applications with
` `the library. If this is what you want to do, use the GNU Library General Public License instead of this License.
`