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chat: Add copyright notice

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This adds a copyright notice in my name with MIT licence permissions
to this file.  The reason is primarily to provide a concrete statement
of permission to use, copy, modify and distribute the program, for the
sake of those who are uncertain about meaning of the public domain.
See for example https://github.com/ppp-project/ppp/issues/474 .
Given that I have maintained this program for 25 years, it seems
reasonable for it to be my copyright on it.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2024-09-18 11:57:45 +10:00
parent 53e6846dff
commit d0c04daa27
1 changed files with 25 additions and 1 deletions
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26
chat/chat.c
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@ -1,7 +1,32 @@
/* SPDX-License-Identifier: MIT */
/*
* Chat -- a program for automatic session establishment (i.e. dial
* the phone and log in).
*
* This version is Copyright 1995-2023 Paul Mackerras <paulus@ozlabs.org>
* based on the original public-domain version by Karl Fox.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the “Software”), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 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 OR COPYRIGHT HOLDERS
* 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.
*
*
* Standard termination codes:
* 0 - successful completion of the script
* 1 - invalid argument, expect string too large, etc.
@ -11,7 +36,6 @@
* 5 - the second string declared as "ABORT"
* 6 - ... and so on for successive ABORT strings.
*
* This software is in the public domain.
*
* -----------------
* 22-May-99 added environment substitutuion, enabled with -E switch.