All files in the CE distribution, to wit:

COPYRIGHT	ce.key		fileio.c	next.opinion	spawn.c
Makefile	ce.tutorial	func.c		paragraph.c	teach-ce
ORIGIN		cinfo.c		help.c		random.c	tty.c
basic.c		complete.c	key.c		regexp.c	ttyio.c
bind.c		dir.c		line.c		regexp.h	ttyio.c.sys5
buffer.c	display.c	main.c		region.c	version.c
ce.h		externs.h	malloc.c	rsearch.c	window.c
ce.help		file.c		ml.c		search.c	word.c

Are subject to the following copyright:

/*
 * This file is part of the CE editor, and is
 * Copyright (c) 1987, 1988, 1989 by Chester Ramey.
 *
 * Permission is hereby granted to copy, reproduce, redistribute or
 * otherwise use this software subject to the following: 
 * 	1) That there be no monetary profit gained specifically from 
 *	   the use or reproduction of this software.
 * 	2) This software may not be sold, rented, traded or otherwise 
 *	   marketed.
 * 	3) This copyright notice must be included prominently in any copy
 * 	   made of this software.
 *
 * The author makes no claims as to the fitness or correctness of
 * this software for any use whatsoever, and it is provided as is. 
 * Any use of this software is at the user's own risk.
 */
