This file is indexed.

/usr/share/doc/stone/copyright is in stone 2.3.e-2build1.

This file is owned by root:root, with mode 0o644.

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This package was debianized by Takuro KITAME <kitame@debian.or.jp> on
Wed, 19 May 1999 13:12:10 +0900.

It was downloaded from http://sourceforge.jp/projects/stone/

Upstream Author: Hiroaki Sengoku <sengoku@gcd.forus.or.jp>

Copyright:

License is GPL2. It's explained by COPYING file.
see /usr/share/common-licenses/GPL

And,
 Specific permission is granted for the GPLed code in this distribition
 to be linked to OpenSSL without invoking GPL clause 2(b).

/*
 * stone.c	simple repeater
 * Copyright(c)1995-2001 by Hiroaki Sengoku <sengoku@gcd.org>
 * Version 1.0	Jan 28, 1995
 * Version 1.1	Jun  7, 1995
 * Version 1.2	Aug 20, 1995
 * Version 1.3	Feb 16, 1996	relay UDP
 * Version 1.5	Nov 15, 1996	for Win32
 * Version 1.6	Jul  5, 1997	for SSL
 * Version 1.7	Aug 20, 1997	return packet of UDP
 * Version 1.8	Oct 18, 1997	pseudo parallel using SIGALRM
 * Version 2.0	Nov  3, 1997	http proxy & over http
 * Version 2.1	Nov 14, 1998	respawn & pop
 * Version 2.2			Posix Thread, XferBufMax
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License with
 * your Debian GNU/Linux system, in /usr/share/common-licenses/GPL, or with
 * the Debian GNU/Linux bash source package as the file COPYING.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */