Legal

In plain words first; the terms follow. Nothing here is hidden in the app, either.

Licence terms

1. What you get. KaikuSDR Lite is free to use, by anyone, for personal use, without a time limit. A Full licence is a text issued to a person for one purchase. It allows that person to use the full version on the computers they use. A business buys one licence per user.
2. Versions. A Full licence covers every version of KaikuSDR released up to and including the month in which the year after the purchase ends. Those versions may be used for as long as you like. A later version is not included; the app never installs one by itself, and another year may be bought at any time.
3. Refunds. Within 14 days of buying Full, for any reason. Refunds are handled by our merchant of record, Paddle.
4. Lawful use. Laws on receiving, recording and sharing radio communications differ between countries. You are responsible for making sure your use of KaikuSDR complies with the laws that apply where you use it.
5. No warranty. KaikuSDR is provided as is. We work hard on it and fix what we can, but we cannot promise it suits your purpose or that any receiver works on your computer: that is what Lite is for, before you buy.
6. The software. You may not sell, rent or share your licence, or remove or work around the licence check. The open-source libraries inside KaikuSDR keep their own licences, listed below; where one of them (LGPL) gives you the right to replace that library, nothing here takes it away.

Privacy

• The app has no account, sends no statistics, and makes no network connection of its own, with three exceptions you start yourself: looking for updates, downloading a speech-to-text model when you choose one, and sending a problem report. Your channels, settings, activity log and recordings stay on your computer. A problem report is written to your computer when the app ends with an error, when a receiver stops, when the page breaks, or when you press Report a problem; it is sent only when you press Send, after you have seen the whole text. It carries the error, your receivers' models and settings and the app's own log, never your name, your channels, your recordings or what was heard; it is kept on your computer whether you send it or not.
• This website sets no cookies and runs no analytics. The server keeps the ordinary access log of a web host for a short time.
• Buying goes through Paddle, our merchant of record, which handles your payment details and your receipt under its own privacy policy. We receive your name, email address and the transaction, which we need to issue your licence; your licence carries your name and email, so that it is yours.
• Email you send to support is kept for as long as it takes to help you.

Who sells KaikuSDR

KaikuSDR is made and sold by (the company's name), a limited company registered in Finland, business ID (Y-tunnus), (address). Write to support@kaikusdr.example. Payments are taken by Paddle.com Market Ltd (and Paddle.com Inc. for US buyers) as merchant of record, which is what your card statement shows.

Open source inside KaikuSDR

KaikuSDR is built on free software, used under its licences, and lists every notice in the app. The main ones:

• .NET and ASP.NET Core, MudBlazor, Velopack, Whisper.net, ONNX Runtime, Silero VAD: MIT.
• whisper.cpp and ggml: MIT. OpenAI Whisper models: MIT.
• Concentus (Opus in managed code): BSD-3-Clause. PFFFT: BSD. libairspy: BSD-3-Clause.
• miniaudio: MIT-0 / public domain. SQLite: public domain.
• libusb, and some receiver libraries: LGPL-2.1, used as separate, replaceable libraries.
• rtl_tcp is not part of KaikuSDR: it is your own copy of a GPL program, run as a separate program when you say so.