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- GNU General Public License
- **************************
-
- Version 1, February 1989
-
- Copyright (C) 1989 Free Software Foundation, Inc.
- 675 Mass Ave, Cambridge, MA 02139, USA
-
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
- Preamble
- =========
-
- The license agreements of most software companies try to keep users
- at the mercy of those companies. By contrast, our 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.
- The General Public License applies to the Free Software Foundation's
- software and to any other program whose authors commit to using it.
- You can use it for your programs, too.
-
- When we speak of free software, we are referring to freedom, not
- price. Specifically, the General Public License is designed to make
- sure that you have the freedom to give away or sell copies of free
- software, 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 a 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 tell them 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.
-
- The precise terms and conditions for copying, distribution and
- modification follow.
-
- TERMS AND CONDITIONS
-
- 1. This License Agreement 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 work containing the Program or a portion of it, either
- verbatim or with modifications. Each licensee is addressed as
- "you".
-
- 2. 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 General Public License
- and to the absence of any warranty; and give any other
- recipients of the Program a copy of this General Public License
- along with the Program. You may charge a fee for the physical
- act of transferring a copy.
-
- 3. You may modify your copy or copies of the Program or any portion
- of it, and copy and distribute such modifications under the
- terms of Paragraph 1 above, provided that you also do the
- following:
-
- * cause the modified files to carry prominent notices stating
- that you changed the files and the date of any change; and
-
- * cause the whole of any work that you distribute or publish,
- that in whole or in part contains the Program or any part
- thereof, either with or without modifications, to be
- licensed at no charge to all third parties under the terms
- of this General Public License (except that you may choose
- to grant warranty protection to some or all third parties,
- at your option).
-
- * If the modified program normally reads commands
- interactively when run, you must cause it, when started
- running for such interactive use in the simplest and most
- usual 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
- General Public License.
-
- * 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.
-
- Mere aggregation of another independent work with the Program
- (or its derivative) on a volume of a storage or distribution
- medium does not bring the other work under the scope of these
- terms.
-
- 4. You may copy and distribute the Program (or a portion or
- derivative of it, under Paragraph 2) in object code or
- executable form under the terms of Paragraphs 1 and 2 above
- provided that you also do one of the following:
-
- * accompany it with the complete corresponding
- machine-readable source code, which must be distributed
- under the terms of Paragraphs 1 and 2 above; or,
-
- * accompany it with a written offer, valid for at least three
- years, to give any third party free (except for a nominal
- charge for the cost of distribution) a complete
- machine-readable copy of the corresponding source code, to
- be distributed under the terms of Paragraphs 1 and 2 above;
- or,
-
- * accompany it with the information you received as to where
- the corresponding source code may be obtained. (This
- alternative is allowed only for noncommercial distribution
- and only if you received the program in object code or
- executable form alone.)
-
- Source code for a work means the preferred form of the work for
- making modifications to it. For an executable file, complete
- source code means all the source code for all modules it
- contains; but, as a special exception, it need not include
- source code for modules which are standard libraries that
- accompany the operating system on which the executable file
- runs, or for standard header files or definitions files that
- accompany that operating system.
-
- 5. You may not copy, modify, sublicense, distribute or transfer the
- Program except as expressly provided under this General Public
- License. Any attempt otherwise to copy, modify, sublicense,
- distribute or transfer the Program is void, and will
- automatically terminate your rights to use the Program under
- this License. However, parties who have received copies, or
- rights to use copies, from you under this General Public License
- will not have their licenses terminated so long as such parties
- remain in full compliance.
-
- 6. By copying, distributing or modifying 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.
-
- 7. 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.
-
- 8. 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 the 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 the license, you
- may choose any version ever published by the Free Software
- Foundation.
-
- 9. 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
-
- 10. 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.
-
- 11. 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
-
-
-
-
- Conditions for Using Bison
- **************************
-
- Bison grammars can be used only in programs that are free software.
- This is in contrast to what happens with the GNU C compiler and the
- other GNU programming tools.
-
- The reason Bison is special is that the output of the Bison
- utility--the Bison parser file--contains a verbatim copy of a sizable
- piece of Bison, which is the code for the `yyparse' function. (The
- actions from your grammar are inserted into this function at one
- point, but the rest of the function is not changed.)
-
- As a result, the Bison parser file is covered by the same copying
- conditions that cover Bison itself and the rest of the GNU system:
- any program containing it has to be distributed under the standard
- GNU copying conditions.
-
- Occasionally people who would like to use Bison to develop
- proprietary programs complain about this.
-
- We don't particularly sympathize with their complaints. The purpose
- of the GNU project is to promote the right to share software and the
- practice of sharing software; it is a means of changing society. The
- people who complain are planning to be uncooperative toward the rest
- of the world; why should they deserve our help in doing so?
-
- However, it's possible that a change in these conditions might
- encourage computer companies to use and distribute the GNU system.
- If so, then we might decide to change the terms on `yyparse' as a
- matter of the strategy of promoting the right to share. Such a
- change would be irrevocable. Since we stand by the copying
- permissions we have announced, we cannot withdraw them once given.
-
- We mustn't make an irrevocable change hastily. We have to wait until
- there is a complete GNU system and there has been time to learn how
- this issue affects its reception.
-
-