Terms of Service

Last updated: 8 September 2026

These terms apply to all products and services provided by David Arthur Software, including DuoVox and QuietTime. By downloading, installing, or using any of our products, you agree to these terms.

1. General Terms

1.1 Description of Services

David Arthur Software develops and distributes desktop and mobile applications. Our current products include:

  • DuoVox — Real-time voice transcription and translation for Windows
  • QuietTime — Parental screen time control for Android and Windows
  • CCTV Converter — A free Windows video conversion utility

1.2 Acceptance of Terms

By using any of our products, you confirm that you have read, understood, and agree to be bound by these terms. If you do not agree, please do not use our products.

1.3 Changes to These Terms

We may update these terms from time to time. Continued use of our products after changes are published constitutes acceptance. We will update the "Last updated" date at the top of this page.

2. DuoVox — Additional Terms

2.1 Free and Paid Versions

DuoVox is available in two versions:

  • Free — Offline transcription using on-device processing. May display in-app promotional messages or light banner advertising. No account required.
  • Paid — AI-powered online transcription and translation in 43 languages on Professional and 33 on Standard, distributed through the Microsoft Store. Pay-As-You-Go credits are also available without a subscription. Current pricing and feature tiers are published at duovox.net.

2.2 Important Limitations

DuoVox is an assistive tool only. It is not a certified or human interpretation or translation service, does not replace a qualified human interpreter or translator, and is not a medical device or regulatory-approved for clinical use. Its output is automated and can be wrong, so you must not rely on it as the sole or authoritative source of meaning in any high-stakes situation (medical, legal, safety-critical, financial, immigration, or law-enforcement) — always verify anything important independently.

2.3 Full DuoVox Terms

DuoVox is governed by its own full Terms of Use, which set out its accuracy, liability (including a liability cap), data-protection, billing, and acceptable-use provisions in full. Those terms apply to your use of DuoVox and are available at davidarthur.app/duovox/terms/ and at duovox.net/terms.html; they are also shown in the app when you first launch it, and the copy shown there is the version you accepted. Where those terms and this page differ on anything concerning DuoVox, the DuoVox Terms of Use prevail. The same applies to any other product that publishes its own terms; this page governs where a product does not.

3. QuietTime — Additional Terms

3.1 Purpose

QuietTime is a parental tool designed to assist with managing screen time. It is not a security product and does not guarantee that device access will be prevented in all circumstances.

3.2 PIN and Recovery Password

You are solely responsible for remembering your PIN and recovery password. If both are lost, the only way to regain access is to clear the app's data or reinstall, which will remove all settings and schedules.

3.3 Data Storage

All QuietTime data — including PINs, recovery passwords, schedules, and activity logs — is stored locally on your device. No data is transmitted to any external server.

3.4 Activity Log

QuietTime records certain events locally, including block period start/end times, overrides, time extensions, and settings changes. This data is stored only on your device and is never transmitted externally.

3.5 Free and Voluntary Donations

QuietTime is free on the Microsoft Store and (where available) Google Play. There are no in-app purchases, subscriptions, or paid tiers. All features are available to every user.

The App includes an optional “Buy me a coffee” button that opens an external website (buymeacoffee.com/dasoftware) where users may choose to support development with a voluntary donation. Donations are entirely optional, processed by Buy Me a Coffee under its own terms, and have no effect on access to App features. See our Refunds page for the position on Buy Me a Coffee tips.

4. CCTV Converter — Additional Terms

4.1 Free

CCTV Converter is free on the Microsoft Store. There are no in-app purchases, subscriptions, or paid tiers. All features are available to every user.

4.2 Offline Operation

CCTV Converter runs entirely on your computer. It has no cloud services, no accounts and no analytics. Your footage is read, converted, and written locally and never leaves your device. The only network request the App makes is an update check: automatically about once a day when it starts, and whenever you choose “Check for updates”. The Microsoft Store edition asks the Store’s own update service; the direct-download edition requests a small static version file from davidarthur.app. An update check transmits none of your settings, files or footage, and nothing is downloaded or installed without your consent. The App makes no other network requests.

4.3 Bundled ffmpeg

CCTV Converter relies on a bundled copy of ffmpeg for video format detection and conversion. ffmpeg is distributed under its own open-source licence (LGPL/GPL); your use of CCTV Converter is also subject to those licence terms.

4.4 Accuracy and Limitations

CCTV Converter detects video formats from signature bytes and converts to standard MP4. It supports Xiongmai IMKH, Dahua DHAV, Hikvision, raw H.264/H.265 and common video containers including MP4/MOV, AVI, Matroska/WebM, MPEG-TS, MPEG-PS, ASF/WMV and Flash Video, covering 27 file extensions in total. Footage from some systems (for example Bosch, Axis and Milestone) is identified but needs the vendor’s own player. Vendor-encrypted formats — for example Hikvision .crypt backups — are not recognised by any third-party tool: the App does not list them, so they will not appear among your files. Files it does list but cannot decode are marked “Cannot convert”. The optional date/time overlay reads each file's modification timestamp and is provided for convenience; if accurate evidence-grade timestamping is critical, verify the source timestamps independently. Converted, edited, or trimmed output should not be relied upon as the sole forensic or legal record; where footage may be used for insurance, legal, or law-enforcement purposes, always retain and verify the original source files.

4.5 Acceptable Use

You agree not to:

  • Use CCTV Converter for any illegal purpose
  • Reverse-engineer, decompile, or modify the application
  • Redistribute or resell the application
  • Use the application to process footage you do not have a lawful right to access

4.6 Full CCTV Converter terms

CCTV Converter is also governed by its own full Terms of Use, available at davidarthur.app/cctvconverter/terms/, which set out the same provisions in full alongside warranties, liability, governing law and contact details. Where those terms and this page differ on anything concerning CCTV Converter, the CCTV Converter Terms of Use prevail.

5. Intellectual Property

All applications, content, designs, and code are the property of David Arthur Software. You are granted a limited, non-exclusive, non-transferable licence to use the software for personal or business purposes in accordance with these terms.

6. Third-Party Services

Some of our products rely on third-party services for AI processing, advertising, payment processing, and app distribution. Third-party AI providers may keep limited operational logs under their own privacy policies; see our Privacy Policy for details. We are not responsible for the availability, accuracy, or policies of these third-party services.

7. Disclaimer of Warranties

All software is provided "as is" and "as available" without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, and non-infringement.

8. Limitation of Liability

To the maximum extent permitted by law, David Arthur Software shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to loss of data, loss of profits, or business interruption, arising from the use or inability to use our products.

Nothing in these terms excludes or limits any liability that cannot lawfully be excluded or limited, including liability for death or personal injury caused by negligence or for fraud, and nothing in these terms affects your statutory rights as a consumer. Additional liability terms, including a liability cap, apply to DuoVox and are set out in the DuoVox Terms.

9. Cancellation and Refunds

All paid versions of our apps are sold and billed exclusively through Google Play and the Microsoft Store. We do not take direct payments through our website. Cancellations and refunds are therefore handled by those platforms under their own published policies:

For any paid subscriptions, you may cancel at any time through the platform where you subscribed. Cancellation takes effect at the end of the current billing period. See our Refunds page for more detail, including the position on Buy Me a Coffee tips.

10. Termination

You may stop using our products at any time by uninstalling them. We reserve the right to suspend or terminate access to our services if these terms are violated.

11. Governing Law

These Terms are governed by the laws of England and Wales. The courts of England and Wales have non-exclusive jurisdiction. If you are a consumer you may also be entitled to bring proceedings in the courts of your country of residence; and where the mandatory law of your country of residence requires a version of these Terms in your local language to prevail, that version will prevail in the event of any conflict — otherwise the English version prevails.

12. Privacy

Our Privacy Policy forms part of these Terms. Where David Arthur Software processes personal data, it does so in accordance with that policy and applicable data-protection law and retains its own data-protection responsibilities. For data-protection queries, contact info@davidarthur.app (for DuoVox, info@duovox.net).

13. Contact

If you have any questions about these terms, please contact us:

David Arthur Software, Kirkbymoorside, York, YO62 6LJ, United Kingdom. Contact: info@davidarthur.app.

© 2026 David Arthur Software