/usr/share/calc/help/COPYING is in apcalc-common 2.12.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is Copyrighted
------------------------
This file is covered under the following Copyright:
Copyright (C) 1999-2008 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.
# @(#) $Revision: 30.2 $
# @(#) $Id: COPYING,v 30.2 2008/10/24 10:46:52 chongo Exp $
# @(#) $Source: /usr/local/src/cmd/calc/RCS/COPYING,v $
=-=
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
The contact addresses for calc is as follows:
Web: http://www.isthe.com/chongo/tech/comp/calc/email.html
To join the low volume calc mailing list. Send a EMail message to:
calc-tester-request at asthe dot com
Your subject must contain the words:
calc mailing list subscription
You may have additional words in your subject line.
Your message body (not the subject) should consist of:
subscribe calc-tester address
end
name your_full_name
where ``address'' is your EMail address and ``your_full_name'' is
your full name.
Feel free to follow the name line with additional EMail text as desired.
=-=
Calc bug reports and calc bug fixes should be sent to:
calc-bugs at asthe dot com
[[ NOTE: Replace 'at' with @, 'dot' is with . and remove the spaces ]]
[[ NOTE: The EMail address uses 'asthe' and the web site URL uses 'isthe' ]]
Your subject must contain the words:
calc bug report
You may have additional words in your subject line.
=-=
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
These files are not covered under one of the Copyrights listed above:
sha1.c sha1.h COPYING
COPYING-LGPL cal/qtime.cal 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.
Some of these exception files are in the public domain. Other files
are under the LGPL but have different authors that those listed above.
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.
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