sigil.radio
End User License Agreement
Effective 11 July 2026 · applies to release builds
This agreement covers using Sigil, the macOS signal-analysis application. We've kept it in plain language — if anything is unclear, ask us at [email protected]. Pre-release builds are covered by the beta agreement instead.
1. This agreement
By installing or using Sigil you accept these terms. If you don't accept them, don't use the software; if you've bought a license, the refund policy applies.
2. Your license
When you buy Sigil we grant you a non-exclusive, non-transferable license to install and use it. The license is perpetual for the versions it covers: what you've licensed keeps working, without subscription, for as long as you keep it installed. Which updates your license includes is stated at purchase.
Your license key states who it is licensed to and how many of your devices it covers. Sigil is licensed, not sold; we keep all rights not expressly granted here.
3. Free features and trials
Parts of Sigil may be usable without any license key, and paid features may offer a time-limited trial, after which they lock until a key is entered. Free features and trials are covered by this agreement too.
4. License keys and activation
- Keys are issued to you by name and email address, and the licensed name is shown in the app.
- Keys are personal — don't share, publish, sell, or transfer them. A shared or leaked key may be revoked; a key refunded or charged back is revoked.
- Activation counts your key's seats, but is not required to use the app: validation also works fully offline, and if the license service is unreachable the app proceeds. What activation sends is described in the privacy policy.
5. Purchases and refunds
Sigil is sold through our merchant of record, which handles checkout, payment, applicable taxes, and receipts under its own buyer terms. Our refund policy describes how refunds work.
6. Updates
The app delivers signed updates through its built-in update mechanism (Sparkle), fetched from sigil.radio. Automatic checking can be turned off in Preferences. We may release updates that change or remove features.
7. What you may not do
- Redistribute, sell, rent, or sublicense the software or any license key.
- Reverse engineer, decompile, or disassemble the software, except where law expressly permits it despite this limitation.
- Remove, disable, or work around license enforcement.
- Use the software in violation of applicable law.
8. Third-party device libraries
Support for SDR hardware relies on optional device libraries (for example the RTL-SDR, HackRF, UHD, and SoapySDR libraries) that you install yourself. They are not part of Sigil, are not bundled with it, and are licensed to you by their authors under their own terms. Sigil loads them at runtime if present, and works without them for analyzing recordings.
9. Using radios lawfully
Sigil is receive-only analysis software, but what you may lawfully receive, record, decode, or disclose varies by country. You are responsible for operating your radio hardware and using your captures in compliance with the laws of your jurisdiction.
10. Export compliance
The software is subject to U.S. export control and sanctions laws, including the Export Administration Regulations. You confirm that you are not located in, and will not export, re-export, or provide the software to, any embargoed country, and that you are not on any U.S. government denied-party or blocked-party list. You agree not to use or transfer the software contrary to those laws.
11. Privacy
What the app and our services do and don't process is covered by the privacy policy. In short: no analytics, no telemetry, and your signal data stays on your Mac.
12. No warranty
THE SOFTWARE IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS DOES NOT AFFECT WARRANTIES OR REMEDIES THAT APPLICABLE LAW DOES NOT ALLOW TO BE EXCLUDED.
13. Limitation of liability
TO THE MAXIMUM EXTENT PERMITTED BY LAW, WE WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES, OR FOR LOSS OF DATA, ARISING FROM THE SOFTWARE OR THIS AGREEMENT, EVEN IF ADVISED OF THE POSSIBILITY. OUR TOTAL LIABILITY UNDER THIS AGREEMENT IS LIMITED TO THE AMOUNT YOU PAID FOR YOUR LICENSE.
14. Termination
This agreement ends automatically if you materially breach it, and your license ends with it. Sections 12 and 13 survive termination.
15. Changes
The current agreement always lives at this address with its effective date above; material changes will be noted in release notes. Changes apply to versions released after the change.