It was downloaded from
  http://downloads.asterisk.org/pub/telephony/dahdi-linux/

This package includes the full source tarball of dahdi-linux. The
binary package includes several non-free firmware files that have been
removed of the dahdi-linux package, as well as a simple script to
download some other firmware files that have not been included.

The binary package contains mainly firmware files covered by 
drivers/dahdi/xpp/firmwares/LICENSE.firmware:

The firmware files (*.hex) in this directory are software for the 
Astribank itself and not intended to run on the Linux system itself. 
They are freely distriributable (see exact terms below).

/****************************************************************************/
/*  Copyright (c) 2004-2006 Xorcom Inc. All Rights Reserved.                */
/*  Redistribution and use of the microcode software ( Firmware ) is        */
/*  permitted provided that the following conditions are met:               */
/*                                                                          */
/*          1. Firmware is redistributed verbatim without any modification; */
/*          2. Any reproduction of Firmware must contain the above          */
/*             copyright notice, this list of conditions and the below      */
/*             disclaimer in the documentation and/or other materials       */
/*             provided with the distribution; and                          */
/*          3. The name of Xorcom may not be used to endorse or promote     */
/*             products derived from this Firmware without specific prior   */
/*             written consent.                                             */
/*                                                                          */
/*  Disclaimer: Xorcom provides this firmware "as is" with no warranties    */
/*  or indemnities whatsoever. Xorcom expressly disclaims any express,      */
/*  statutory or implied warranties, including, but not limited to, the     */
/*  implied warranties of merchantability, fitness for a particular         */
/*  purpose and non-infringement. In no event shall Xorcom be liable for    */
/*  any direct, indirect, incidental, special, exemplary, or consequential  */
/*  damages (including, but not limited to, procurement of substitute       */
/*  goods or services; loss of use, data, or profits; or business           */
/*  interruption) however caused and on any theory of liability, whether    */
/*  in contract, strict liability, or tort (including negligence or         */
/*  otherwise) arising in any way out of the use of this firmware, even     */
/*  if advised of the possibility of such damage. User acknowledges and     */
/*  agrees that the purchase or use of the firmware will not create or      */
/*  give grounds for a license by implication, estoppel, or otherwise in    */
/*  any intellectual property rights (patent, copyright, trade secret,      */
/*  mask work, or other proprietary right) embodied in any other Xorcom     */
/*  hardware or firmware either solely or in combination with the firmware. */
/****************************************************************************/


drivers/dahdi/firmware/Makefile and README are, as most other parts of DAHDI, 
is license under the terms of GPLv2 .

The rest of the files mentioned below are not included in the binary package.

Summary:
The bulk of the code, under drivers/dahdi/ , is licensed under the terms
of GPLv2. Various drivers (e.g.: all non-Digium drivers) are licensed as
GPLv2.+ . Two other files (mmx.h, XppConfig.pm) are licensed under a more
permissive license.


Upstream Authors: Jim Dixon / Zapate Telephony, Linux Support Services, Inc.

Copyright (from drivers/dahdi/tor2.c):

/*
 * Tormenta 2  Quad-T1 PCI Driver
 *
 * Written by Mark Spencer <markster@digium.com>
 * Based on previous works, designs, and archetectures conceived and
 * written by Jim Dixon <jim@lambdatel.com>.
 *
 * Copyright (C) 2001 Jim Dixon / Zapata Telephony.
 * Copyright (C) 2001-2008, Digium, Inc.
 *
 */

/*
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2 as published by the
 * Free Software Foundation. See the LICENSE file included with
 * this program for more details.
 */

The file LICENSE is a verbatim copy of the GNU General Public License, v.2.

On Debian systems, a copy of the GNU General Public License v.2 may be
found in /usr/share/common-licenses/GPL-2.

Other Portions:

drivers/dahdi/octapi: GPLv.2+

    Copyright (c) 2001-2007 Octasic Inc.

This file is part of the Octasic OCT6100 GPL API . The OCT6100 GPL API  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 of the License, or (at your option) any later version.

The OCT6100 GPL API 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 the OCT6100 GPL API; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.


drivers/dahdi/datamods/syncppp.c: GPLv.2+

 *	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 of the license, or (at your option) any later version.
 *
 *	Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz>
 * Copyright (C) 1994 Cronyx Ltd.
 * Author: Serge Vakulenko, <vak@zebub.msk.su>


drivers/dahdi/xpp/XppConfig.pm: GPL 1+ || Artistic

# Written by Oron Peled <oron@actcom.co.il>
# Copyright (C) 2008, Xorcom
# This program is free software; you can redistribute and/or
# modify it under the same terms as Perl itself.


Other copyright holders:

drivers/dahdi/dahdi_dummy.c:  * Copyright (C) 2002, Hermes Softlab

drivers/dahdi/dahdi_echocan_sec2.c: Copyright (C) 2001 Steve Underwood
drivers/dahdi/dahdi_echocan_sec.c: Copyright (C) 2001 Steve Underwood
drivers/dahdi/ecdis.h: Copyright (C) 2001 Steve Underwood
drivers/dahdi/datamods/hdlc_*.c: * Copyright (C) 1999 - 2005 Krzysztof Halasa <khc@pm.waw.pl>

The Debian packaging is:
Copyright (C) 2010, Tzafrir Cohen <tzafrir.cohen@xorcom.com> 
and is licensed under the terms of the GPLv2 or any later version.

On Debian systems, the complete text of the GNU General Public
License v.2 can be found in `/usr/share/common-licenses/GPL-2'.
