Legal

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Website

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Legal Talk

HOBBY

This software is available free of charge for hobby users such as radio amateurs and shortwave enthusiasts. (The development is funded by donations and commercial licences.)


EDUCATION

This software is available free of charge for use in schools, colleges, training facilities.


COMMERCIAL

As of April 1st, 2020 world-wide commercial licencing uses honour-ware:

 

  • No legal requirement to purchase a licence,
  • You are honour-bound to pay for the licences using PayPal , just keep your PayPal receipt,
  • Price per licence (per seat) is $125.

 

Renewals

Websites and their renewal dates.

Site Date Registrar
sdr-radio.com Match 18th, 2028 Network Solutions
dit-dit-dit.com April 30th, 2022 GoDaddy
sdr-satellites.com June 8th, 2023 GoDaddy
dx-galaxy.com April 2nd, 2025 GoDaddy
sdrspace.com November 17th, 2025 GoDaddy

xiph / rrnoise

Code from the rrnoise DSP library [link] is used in noise reduction and voice activity detection. The following text is copied directly from the licencing file.
...
Copyright (c) 2017, Mozilla
Copyright (c) 2007-2017, Jean-Marc Valin
Copyright (c) 2005-2017, Xiph.Org Foundation
Copyright (c) 2003-2004, Mark Borgerding

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.

Speex DSP

Code from the Speex DSP library [link] is used in noise reduction and voice activity detection. The following text is copied directly from preprocess.c .
...
Copyright (C) 2003 Epic Games (written by Jean-Marc Valin)
Copyright (C) 2004-2006 Epic Games 

File: preprocess.c
Preprocessor with denoising based on the algorithm by Ephraim and Malah

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.
  • The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

Viridis Palette

The viridis colour palette is one of the matplotlib colormaps designed by Nathaniel J. Smith, Stefan van der Walt, and (in the case of viridis) Eric Firing. The colormaps are released under the CC0 license 

Public domain dedication. We would appreciate credit if you use or redistribute these colormaps, but do not impose any legal restrictions.

To the extent possible under law, the persons who associated CC0 with mpl-colormaps have waived all copyright and related or neighboring rights to mpl-colormaps.

1€ Filter

The One Euro filter implementation uses OneEuroFilter.cc, author: Nicolas Roussel (nicolas.roussel@inria.fr), Copyright 2019 Inria.
Released under the The 3-Clause BSD License.

Youssef Touil

Many thanks to Youssef (SDR#, Airspy) for excellent DSP code using in decimation.

GeoLite2

This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com..