Pd, as well as this compilation of Pd-related software known as Purr-Data a.k.a. Pd-l2ork 2.x, is copyrighted software by various authors, but it is distributed as open-source software, which means that it can be used freely and without any costs under the appropriate license terms, as detailed below.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS “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 AUTHORS 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.
Copyright (c) by Miller S. Puckette and others
Pd (the core system including the main program and the built-in objects, i.e., everything that lives in the pd subdirectory of the sources) is licensed under a 3-clause BSD license, please check the LICENSE.txt file for details.
Copyright (c) by various authors, please see the included license files for details
Purr-Data includes a large number of bundled abstractions and externals by various authors. These can be found in the abstractions, externals and Gem subdirectories in the source, and in the extra subdirectory of the Purr-Data library directory of the installed application. Each of these items has its own open-source license under which it is distributed (mostly different variations of the BSD license or the GPL), so please check the corresponding license files in the source or the extra directory of the installed package for license information pertaining to each of the different software modules.
Copyright (c) by Hans-Christoph Steiner, Ico Bukvic, Jonathan Wilkes and others
Purr-Data (by Jonathan Wilkes) is based on Pd-l2ork (by Ico Bukvic) which in turn is based on Pd-extended (by Hans-Christoph Steiner), which is licensed under the GPL (GNU Public License) version 3, replicated below. Please note that this license applies to all parts of this package which are not accompanied by their own license conditions (such as the Pd core and the bundled software, as detailed above).
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
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If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the copyright line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>.Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.The hypothetical commands show w and show c
should show the appropriate parts of the General Public License. Of
course, your program’s commands might be different; for a GUI interface,
you would use an about box.
You should also get your employer (if you work as a programmer) or school, if any, to sign a copyright disclaimer for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see http://www.gnu.org/licenses/.
The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read http://www.gnu.org/philosophy/why-not-lgpl.html.