[질문]오픈소스 중에서 소스의 첫부분에 나오는 주석은 어떤 툴?

오픈소스들의 소스 첫부분에 보면 보통 다음과 같은 주석이 있는데요..

/* Nessus
 * Copyright (C) 1998 - 2002 Renaud Deraison
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation
 *
 * 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
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * In addition, as a special exception, Renaud Deraison
 * gives permission to link the code of this program with any
 * version of the OpenSSL library which is distributed under a
 * license identical to that listed in the included COPYING.OpenSSL
 * file, and distribute linked combinations including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * this file, you may extend this exception to your version of the
 * file, but you are not obligated to do so.  If you do not wish to
 * do so, delete this exception statement from your version.
 *
 * $Id: nessusd.c,v 1.1.1.1 2004/02/04 02:11:00 lhuijae Exp $
 */

거의 대부분의 오픈소스 소스들이 이런 주석을 가지고 있던데.. 특별한 툴을 사용하기때문에 기본적으로 나타나는 주석인가요? 아니면 직접 쓰는건가요?