rafael:
It is in the source code, and now GNU, (it didn't use to be though)
from app_nv_faxdetect.c
/*
* Asterisk -- A telephony toolkit for Linux.
*
* Fax detection application for all channel types.
*
* Copyright (C) 2004-2005, Newman Telecom, Inc. and Newman Ventures, Inc.
*
* Justin Newman <
jnewman@newmantelecom.com>
*
* We would like to thank Newman Ventures, Inc. for funding this
* Asterisk project.
*
* Newman Ventures <
info@newmanventures.com>
*
* Portions Copyright:
* Copyright (C) 2001, Linux Support Services, Inc.
* Copyright (C) 2004, Digium, Inc.
*
* Matthew Fredrickson <
creslin@linux-support.net>
* Mark Spencer <
markster@digium.com>
*
* This program is free software, distributed under the terms ofit is
* the GNU General Public License
*/