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Licensing

[Last Update: $Date: 2007-11-11 09:26:19 +0000 (Sun, 11 Nov 2007) $]

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The SOFTWARE

PJSIP software ("The SOFTWARE") consists of:

pjlib	A cross-platforms portability and framework library,
pjlib-util	An adjunct library to pjlib which provides various utility functions,
pjnath	A NAT traversal helper library,
pjmedia	A multimedia communications library,
pjmedia-codec	A placeholder library to support various multimedia codecs,
pjsip	A SIP protocol stack collections.

and any and all build scripts, makefiles, tools, samples, and/or applications available and/or required to use or modify such software.

The SOFTWARE may provide links to third party libraries or code (collectively "Third Party Software") to implement various functions, and access to Third Party Software may be included along with the SOFTWARE delivery as a convenience. Third Party Software does not comprise part of the SOFTWARE.

License

The SOFTWARE is released under dual license, open source (GPL) or alternative license.

The SOFTWARE may be used according to Free Software GNU General Public License (GPL) version 2, or (at your option) any later version, with special exception to permit linking with some Open Source Third Party libraries set out below.

The GPL allows you to compile, modify, link, or combine the SOFTWARE with other software, commercial or non-commercial, as long as the resulting program complies with GPL. Copy of GNU General Public License is available on the http://www.gnu.org. More information about GPL can be found in GPL FAQ.

Alternative License

If you can't comply with GPL, an alternative licensing scheme may be arranged.

Special Exception

As a special exception to GPL, the author of the SOFTWARE gives permission to link the SOFTWARE with Open Source Third Party Software below, and distribute the linked combinations. GNU General Public License must be obeyed in all respects for all of the code used other than those Third Party Software.

Third Party Licensing Requirements

In addition to the licensing requirements of the SOFTWARE, you must make sure that your software meets the licensing requirements of the third party libraries below. Some third party libraries may require attributions to be placed in the software, significant portion of the software, and/or in the accompanying documentation.

Older Version

Older PJSIP (the 0.2.9.x series) was released under GNU Lesser General Public License (LGPL), and it would stay this way.

Third Party Software

The use of Third Party Software may or may not be made optional (depending on the nature of the software).

Contributed and Public Domain Third Party Software

Contributed and Public Domain Third Party Software below can be used according to the SOFTWARE licenses, without no further restrictions.

ACE Timer Heap

Software: Timer heap management of Adaptive Communication Framework (ACE) Library
Author: Douglas C. Schmidt and his research group at Washington University, University of California, Irvine, and Vanderbilt University, Copyright (c) 1993-2006, all rights reserved
Location: pjlib/timer.[hc]
Description: The timer heap in PJLIB was based on ACE's Timer_Heap
License: Permissions have been obtained from the copyright holder/original author (Douglas C. Schmidt) to use and redistribute this code according to the SOFTWARE licenses. You may, at your option, opt to use ACE license for this particular software.
Using the Software: This code is integral part of the library and can not be disabled.

Alaw/Ulaw Converter

Software

Alaw/ulaw conversion algorithm

Author

Sun Microsystems, Inc

Location

pjmedia/alaw_ulaw.c

Description

PJMEDIA uses G.711 algorithm from Sun Microsystems, Inc.

License

    
    This source code is a product of Sun Microsystems, Inc. and is provided
    for unrestricted use.  Users may copy or modify this source code without
    charge.

    SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
    THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

    Sun source code is provided with no support and without any obligation on
    the part of Sun Microsystems, Inc. to assist in its use, correction,
    modification or enhancement.

    SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
    INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
    OR ANY PART THEREOF.

    In no event will Sun Microsystems, Inc. be liable for any lost revenue
    or profits or other special, indirect and consequential damages, even if
    Sun has been advised of the possibility of such damages.

    Sun Microsystems, Inc.
    2550 Garcia Avenue
    Mountain View, California  94043

Using the Software

This software is not used by default unless PJMEDIA_HAS_ALAW_ULAW_TABLE is disabled. When PJMEDIA_HAS_ALAW_ULAW_TABLE is enabled (the default setting), a table based alaw/ulaw conversion will be used instead.

CRC32 Algorithm

Software

CRC32 algorithm

Author

Location

pjlib-util/crc32.c

License

This software is put in public domain, and can be used for any purpose with no warranty:

    This is an implementation of CRC32. See ISO 3309 and ITU-T V.42 
    for a formal specification

    This file is partly taken from Crypto++ library (http://www.cryptopp.com)
    and http://www.di-mgt.com.au/crypto.html#CRC.

    Since the original version of the code is put in public domain,
    this file is put on public domain as well.

Using the Software

This code is needed by the STUN implementation in PJNATH and can not be disabled.

MD5 Hashing Algorithm

Software

MD5 hashing implementation

Author

Written by Colin Plumb in 1993 based on MD5 algorithm by Ron Rivest, no copyright is claimed.

Location

pjlib-util/md5.c

Description

MD5 hashing for digest authentication.

License

This software is put in public domain, and can be used for any purpose with no warranty:

    This code implements the MD5 message-digest algorithm.
    The algorithm is due to Ron Rivest.  This code was
    written by Colin Plumb in 1993, no copyright is claimed.
    This code is in the public domain; do with it what you wish.

    Equivalent code is available from RSA Data Security, Inc.
    This code has been tested against that, and is equivalent,
    except that you don't need to include two pages of legalese
    with every copy.

    To compute the message digest of a chunk of bytes, declare an
    MD5Context structure, pass it to MD5Init, call MD5Update as
    needed on buffers full of bytes, and then call MD5Final, which
    will fill a supplied 16-byte array with the digest.

Using the Software

This code is needed by SIP digest authentication procedure, and can not be disabled.

SHA1 Encryption

Software

SHA1 encryption

Authors

Steve Reid, James H. Brown, Saul Kravitz, Ralph Giles

Location

pjlib-util/sha1.c

License

This software is put in public domain, and can be used for any purpose with no warranty:

    SHA-1 in C
    By Steve Reid 
    100% Public Domain
    -----------------
    Modified 7/98 
    By James H. Brown 
    Still 100% Public Domain
    -----------------
    Modified 4/01
    By Saul Kravitz 
    Still 100% PD
    Modified to run on Compaq Alpha hardware.  
    -----------------
    Modified 07/2002
    By Ralph Giles 
    Still 100% public domain

Using the Software

This code is needed by the STUN implementation in PJNATH and can not be disabled.

Third Party Software with Licensing Requirements

The use of Third Party Software below will require compliance of the licensing requirements of the Third Party Software. You must make sure that your software meets the licensing requirements of the third party libraries below. Some third party libraries may require attributions to be placed in the software, significant portion of the software, and/or in the accompanying documentation.

GNU Getopt

Software: Command line parsing library, part of GNU LIBC
Author: Copyright (C) 1987,88,89,90,91,92,93,94,96,97 Free Software Foundation, Inc.
Location: pjlib-util/getopt.[hc]
Description: Optional command line parsing library, included in pjlib-util. This normally is only used by console programs.
License: Distributed under opensource GNU LGPL.
Using the Software: This code will only be linked if applications explicitly call pj_getopt() or pj_getopt_long(). Normally application doesn't need to use this, since this functionality is useful for command line/console types of applications only.

PortAudio

Software

Cross platform audio device abstraction (http://www.portaudio.com)

Author

Location

third_party/portaudio/

Description

PortAudio is used as default sound device backend on Windows, Linux/Unix and MacOS X target.

License

PortAudio is an open source project distributed under the following terms:

    Based on the Open Source API proposed by Ross Bencina
    Copyright (c) 1999-2000 Phil Burk

    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files
    (the "Software"), to deal in the Software without restriction,
    including without limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to do so,
    subject to the following conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

Using the Software

The use of this software is controlled by PJMEDIA_SOUND_IMPLEMENTATION macro setting in pjmedia/config.h, and can be overriden by application.

Resample

Software

High Quality Sample Rate Conversion

Location

third_party/resample/

Description

PJMEDIA uses resample-1.7.tar.gz from Digital Audio Resampling Home Page.

Some excerpts from the original source codes:

HISTORY

    The first version of this software was written by Julius O. Smith III
    <jos@ccrma.stanford.edu> at CCRMA <http://www-ccrma.stanford.edu> in
    1981.  It was called SRCONV and was written in SAIL for PDP-10
    compatible machines.  The algorithm was first published in

    Smith, Julius O. and Phil Gossett. ``A Flexible Sampling-Rate
    Conversion Method,'' Proceedings (2): 19.4.1-19.4.4, IEEE Conference
    on Acoustics, Speech, and Signal Processing, San Diego, March 1984.

    An expanded tutorial based on this paper is available at the Digital
    Audio Resampling Home Page given above.

    Circa 1988, the SRCONV program was translated from SAIL to C by
    Christopher Lee Fraley working with Roger Dannenberg at CMU.

    Since then, the C version has been maintained by jos.

    Sndlib support was added 6/99 by John Gibson <jgg9c@virginia.edu>.

    The resample program is free software distributed in accordance
    with the Lesser GNU Public License (LGPL).  There is NO warranty; not
    even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

License

This software is distibuted under opensource GNU LGPL terms.

Using the Software

The resampling software is enabled by default is used by the conference bridge. Define PJMEDIA_HAS_SMALL_FILTER=0 and PJMEDIA_HAS_LARGE_FILTER=0 to disable this software.

Adaptive Silence Detection

Software

Adaptive Silence Detection

Author

OpenH323 Project

Location

pjmedia/silencedet.[hc]

Description

The adaptive silence detector was based on adaptive silence detector implementation in Open H423 project.

License

This software is distributed under opensource Mozilla MPL terms:

    Open H423 Library

    Copyright (c) 1998-2000 Equivalence Pty. Ltd.

    The contents of this file are subject to the Mozilla Public License
    Version 1.0 (the "License"); you may not use this file except in
    compliance with the License. You may obtain a copy of the License at
    http://www.mozilla.org/MPL/

    Software distributed under the License is distributed on an "AS IS"
    basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
    the License for the specific language governing rights and limitations
    under the License.

    The Original Code is Open H423 Library.

    The Initial Developer of the Original Code is Equivalence Pty. Ltd.

    Portions of this code were written with the assisance of funding from
    Vovida Networks, Inc. http://www.vovida.com.

Using the Software

This software is used by various codecs and also by the conference bridge, and can not be disabled.

GSM Codec 06.10

Software

GSM 06.10 Software Library.

Author

Location

third_party/gsm/

Description

PJMEDIA includes uses GSM 06.10 version 1.0 at patchlevel 12

License

Free to use with no warranty:

    Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
    Technische Universitaet Berlin

    Any use of this software is permitted provided that this notice is not
    removed and that neither the authors nor the Technische Universitaet Berlin
    are deemed to have made any representations as to the suitability of this
    software for any purpose nor are held responsible for any defects of
    this software.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.

    As a matter of courtesy, the authors request to be informed about uses
    this software has found, about bugs in this software, and about any
    improvements that may be of general interest.

    Berlin, 28.11.1994
    Jutta Degener
    Carsten Bormann

Using the Software

This software will only be linked if application explicitly initialize the GSM library by calling pjmedia_codec_gsm_init(). Furthermore, it can be explicitly disabled from the link process by defining PJMEDIA_HAS_GSM_CODEC to zero.

Speex

Software

- Speex Codec
- Speex accoustic echo cancellation
- Speex sampling rate conversion

Author

http://www.speex.org

Location

third_party/speex/

Description

PJMEDIA uses Speex codec version 1.1.12. Speex is a high quality, Open source, patent free codec implementation developed by open source community.

License

Speex is distributed under the following free license:

    Copyright 2002-2005 
        Xiph.org Foundation
        Jean-Marc Valin
        David Rowe
        EpicGames
        Analog Devices

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    - Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    - Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

    - Neither the name of the Xiph.org Foundation nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
    CONTRIBUTORS 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
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Using the Software

Speex codec: this software will only be linked if application explicitly initialize the Speex library by calling pjmedia_codec_speex_init(). Furthermore, it can be explicitly disabled from the link process by defining PJMEDIA_HAS_SPEEX_CODEC to zero.

Speex AEC: Speex accoustic echo cancellation is enabled by default for the sound device. Application can disable this by setting PJMEDIA_HAS_SPEEX_AEC to zero.

Speex sample rate converter: Speex sample rate converter is only used when PJMEDIA_HAS_SPEEX_RESAMPLE macro is set to non-zero. The default is disabled.

iLBC Codec

Software: iLBC Audio Codec
Author: Global IP Sound, http://www.ilbcfreeware.org
Location: third_party/ilbc/
Description: PJMEDIA supports iLBC codec, and iLBC codec implementation is included in PJMEDIA source distribution.
License: The use of iLBC requires permission from Global IP Sound, http://www.ilbcfreeware.org. Please see http://www.ilbcfreeware.org/documentation/gips_iLBClicense.pdf for iLBC licensing details.
Using the Software: This software will only be linked if application explicitly initialize the iLBC library by calling pjmedia_codec_ilbc_init(). Furthermore, it can be explicitly disabled from the link process by defining PJMEDIA_HAS_ILBC_CODEC to zero.

OpenSSL

Software

SSL/TLS encryption and transport

Author

http://www.openssl.org

Location

external

Description

PJSIP may be linked with OpenSSL to enable SIP TLS transport.

License

Please see OpenSSL License

Using the Software

SIP TLS transport is disabled by default, and application must enable SIP TLS transport manually by declaring PJSIP_HAS_TLS_TRANSPORT to 1 in config_site.h. OpenSSL library must be installed in order to build SIP TLS transport.

The OpenSSL library itself is not included in PJSIP distribution. With the GNU build system, the configure script will detect the presence of OpenSSL library automatically. On Windows, application must add OpenSSL include and lib paths in Visual Studio directory search paths.

Milenage and Rijndael

Software: Milenage
Author: The implementation was taken from 3GPP TS 35.206 V7.0.0 document.
Location: third_party/milenage/
Description: Milenage algorithm is used for AKAv1-MD5 and AKAv2 SIP digest authentication.
License: Please consult 3GPP TS documents.
Using the Software: The Milenage and Rijndael implementation will only be linked with application if AKA authentication is used and application explicitly calls or makes reference to pjsip_auth_create_aka_response() function.

libSRTP

Software

libSRTP

Author

David A. McGrew, Cisco Systems, Inc.

Location

third_party/srtp/

Description

libSRTP implements Secure RTP/RTCP (SRTP and SRTCP).

License

libSRTPis distributed under the following free license:

/*
 *	
 * Copyright (c) 2001-2006 Cisco Systems, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 *   Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 *   Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 * 
 *   Neither the name of the Cisco Systems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS 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 SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

Please consult 3GPP TS documents.

Using the Software

Copy of libSRTP is included in PJSIP distribution, and it is built by default on all supported platforms. SRTP functionality is also enabled by default. If you wish to disable SRTP, declare PJMEDIA_HAS_SRTP macro to zero.