Audacity(R): free, open source, cross-platform audio software for multi-track recording and editing: https://www.audacityteam.org/ . See the CHANGELOG.txt file for a list of changes. User support is provided on Audacity Forum: https://forum.audacityteam.org/ . We welcome feedback on Audacity, suggestions for new or improved features, and bug reports. Please visit https://forum.audacityteam.org/viewforum.php?f=25 . Audacity is copyright (c) 1999-2021 by Audacity Team. This copyright notice applies to all documents in the Audacity source code archive, except as otherwise noted (mostly in the lib-src subdirectories). "Audacity" is a registered trademark. The Audacity documentation is licensed under the Creative Commons Attribution 3.0 license: https://creativecommons.org/licenses/by/3.0/legalcode . Compilation instructions for Audacity are provided in the BUILDING.md file. You can ask for help with compilation problems at: https://forum.audacityteam.org/viewforum.php?f=19 . If you want to suggest some simple text change in our code, please submit a pull request on https://github.com/audacity/audacity/pulls . It's usually best to discuss functional code changes with us first on the dev discord server: https://discord.gg/N3XKxzTrq3 Licensing and Source Code, Libraries and Additional Copyright Information follows. Licensing -------------------------------------------------------------------------------- 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. The program source code is also freely available as per Section 4 of this README. 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 (in a file called LICENSE.txt); if not, go to https://www.gnu.org/licenses/old-licenses/gpl-2.0.html or write to Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307 USA Source Code, Libraries and Additional Copyright Information ------------------------------------------------------------------------------- Source code to this program is always available; for more information visit our web site at: https://www.audacityteam.org/download/source Audacity is built upon other free libraries; some of these libraries may have come with Audacity in the lib-src directory. Others you are expected to install first if you want Audacity to have certain capabilities. Most of these libraries are not distributed under the terms of the GPL, but rather some other free, GPL-compatible license. Specifically: expat: BSD-like license. Provides XML parsing. Included with Audacity. FFmpeg: GPL or LGPL (according to how you obtain/configure it) Provides decoding/encoding of additional formats. Optional separate download. libid3tag: GPL Reads/writes ID3 tags in MP3 files. Optional separate download as part of libmad. libflac: Xiph.Org BSD-like licence (the parts we use) Decodes and Encodes Free Lossless Audio Codec files. Optional separate download. libmad: GPL Decodes MP3 files. Optional separate download. libmp3lame: LGPL Encodes MP3 files. libnyquist: BSD-like license. Functional language for manipulating audio; available within Audacity for effects processing. libogg: BSD-like license. Optional separate download, along with libvorbis. libsndfile: LGPL Reads and writes uncompressed PCM audio files. Included with Audacity. libsoxr: LGPL The SoX Resampler library performs one-dimensional sample-rate conversion. libvamp: new-style BSD Plug-in interface and support library for audio analysis plug-ins. Included with Audacity. libvorbis: BSD-like license. Decodes and encodes Ogg Vorbis files. Optional separate download. lv2: a merging of the lilv (ISC license), lv2 (LGPL), msinttypes, serd (ISC), sord, sratom, and suil libraries to support LV2 plug-ins. portsmf: BSD-like license. library for reading and writing midi files. Included with Audacity sbsms: GPL v2 Pitch and tempo changing library. Included in Audacity SoundTouch: LGPL Changes tempo without changing pitch and vice versa. Included in audacity SQLite: Public Domain Small and fast SQL database engine. Included in audacity Twolame: LGPL Encodes MPEG I layer 2 audio (used in DVDs and Radio). Optional separate download. wxWidgets: wxWindows license (based on LGPL) Cross-platform GUI library - must be downloaded and compiled separately. For more information, see the documentation inside each library's source code directory. -------------------------------------------------------------------------------- Additional copyright information: -------------------------------------------------------------------------------- Nyquist Copyright (c) 2000-2021, by Roger B. Dannenberg 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 of source code must retain the copyright notice, the list of conditions, and the disclaimer, all three of which appear below under "COPYRIGHT AND LICENSE INFORMATION FOR XLISP." 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. Redistributions in binary form must reproduce the copyright notice, the list of conditions, and the disclaimer, all three of which appear below under "COPYRIGHT AND LICENSE INFORMATION FOR XLISP," in the documentation and/or other materials provided with the distribution. Neither the name of Roger B. Dannenberg, Carnegie Mellon University, nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission. COPYRIGHT AND LICENSE INFORMATION FOR XLISP (part of Nyquist): Copyright (c) 1984-2002, by David Michael Betz 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 David Michael Betz nor the names of any 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 HOLDER 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 HOLDER 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.