COPYING

                calc - arbitrary precision calculator

This file is Copyrighted
------------------------

    This file is not covered under version 2.1 of the GNU LGPL.
    This file is covered under the following Copyright:

        Copyright (C) 1999-2023  Landon Curt Noll
        All rights reserved.

        Everyone is permitted to copy and distribute verbatim copies
        of this license document, but changing it is not allowed.

-=-

Calc is covered by the GNU Lesser General Public License
--------------------------------------------------------

    Calc is open software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation version 2.1 of the License.

    Calc is several binary link libraries, several modules, associated
    interface definition files and scripts used to control its compilation
    and installation.

    Calc 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 Lesser General
    Public License for more details.

    A copy of the GNU Lesser General Public License is distributed with
    calc under the filename:

            COPYING-LGPL

    You may display this file by the calc command:      help copying

    You may display the GNU Lesser General
    Public License by the calc command:                 help copying-lgpl

    You should have received a copy of the version 2.1 GNU Lesser General
    Public License with calc; if not, write to the following address:

            Free Software Foundation, Inc.
            51 Franklin Street
            Fifth Floor
            Boston, MA  02110-1301
            USA

Calc's relationship to the GNU Lesser General Public License
------------------------------------------------------------

    In section 0 of the GNU Lesser General Public License, one finds
    the following definition:

        The "Library", below, refers to any such software library or
        work which has been distributed under these terms.

    Calc is distributed under the terms of the GNU Lesser
    General Public License.

    In the same section 0, one also find the following:

        For a library, 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 library.

    There are at least two calc binary link libraries found in calc:

        libcalc.a       libcustcalc.a

    Clearly all files that go into the creation of those binary link
    libraries are covered under the License.

    The "scripts used to control compilation and installation of the
    of the library" include:

        * Makefiles
        * source files created by the Makefiles
        * source code used in the creation of intermediate source files

     All of those files are covered under the License.

     The "associated interface definition files" are those files that:

        * show how the calc binary link libraries are used
        * test the validity of the binary link libraries
        * document routines found in the binary link libraries
        * show how one can interactively use the binary link libraries

     Calc provides an extensive set of files that perform the above
     functions.

        * files under the sample sub-directory
        * files under the help sub-directory
        * files under the lib sub-directory
        * the main calc.c file

     The "complete source code" includes ALL files shipped with calc,
     except for the exception files explicitly listed in the "Calc
     copyrights and exception files" section below.

-=-

Calc copyrights and exception files
-----------------------------------

    With the exception of the files listed below, Calc is covered under
    the following GNU Lesser General Public License Copyrights:

        Copyright (C) year  David I. Bell
        Copyright (C) year  David I. Bell and Landon Curt Noll
        Copyright (C) year  David I. Bell and Ernest Bowen
        Copyright (C) year  David I. Bell, Landon Curt Noll and Ernest Bowen
        Copyright (C) year  Landon Curt Noll
        Copyright (C) year  Ernest Bowen and Landon Curt Noll
        Copyright (C) year  Ernest Bowen
        Copyright (C) year  Petteri Kettunen and Landon Curt Noll
        Copyright (C) year  Christoph Zurnieden
        Copyright (C) year  Landon Curt Noll and Thomas Jones-Low
        Copyright (C) year  Klaus Alexander Seistrup and Landon Curt Noll

    These files are not covered under one of the Copyrights listed above:

            sha1.c              sha1.h          COPYING
            COPYING-LGPL        cal/screen.cal

    The file COPYING-LGPL, which contains a copy of the version 2.1
    GNU Lesser General Public License, is itself Copyrighted by the
    Free Software Foundation, Inc.  Please note that the Free Software
    Foundation, Inc. does NOT have a copyright over calc, only the
    COPYING-LGPL that is supplied with calc.

    This file, COPYING, is distributed under the Copyright found at the
    top of this file.  It is important to note that you may distribute
    verbatim copies of this file but you may not modify this file.

    These files are covered under "The Unlicense":

            sha1.c
            sha1.h
            cal/dotest.cal
            cal/screen.cal

    "The Unlicense" is as follows:

        This is free and unencumbered software released into the public domain.

        Anyone is free to copy, modify, publish, use, compile, sell, or
        distribute this software, either in source code form or as a compiled
        binary, for any purpose, commercial or non-commercial, and by any
        means.

        In jurisdictions that recognize copyright laws, the author or authors
        of this software dedicate any and all copyright interest in the
        software to the public domain. We make this dedication for the benefit
        of the public at large and to the detriment of our heirs and
        successors. We intend this dedication to be an overt act of
        relinquishment in perpetuity of all present and future rights to this
        software under copyright law.

        THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
        EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
        MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
        IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
        OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
        ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
        OTHER DEALINGS IN THE SOFTWARE.

        For more information, please refer to <http://unlicense.org/>

    In all cases one may use and distribute these exception files freely.
    And because one may freely distribute the LGPL covered files, the
    entire calc source may be freely used and distributed.

-=-

General Copyleft and License info
---------------------------------

    For general information on Copylefts, see:

        http://www.gnu.org/copyleft/

    For information on GNU Lesser General Public Licenses, see:

        http://www.gnu.org/copyleft/lesser.html
        http://www.gnu.org/copyleft/lesser.txt

-=-

Why calc did not use the GNU General Public License
---------------------------------------------------

    It has been suggested that one should consider using the GNU General
    Public License instead of the GNU Lesser General Public License:

        http://www.gnu.org/philosophy/why-not-lgpl.html

    As you can read in the above URL, there are times where a library
    cannot give free software any particular advantage.  One of those
    times is when there is significantly similar versions available
    that are not covered under a Copyleft such as the GNU General Public
    License.

    The reason why calc was placed under the GNU Lesser General Public
    License is because for many years (1984 thru 1999), calc was offered
    without any form of Copyleft.  At the time calc was placed under
    the GNU Lesser General Public License, a number of systems and
    distributions distributed calc without a Copyleft.