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Licence
SEO Merlin is WordPress software, and WordPress software is licensed under the GPL. That isn’t a marketing choice — it’s a requirement of building on WordPress, and we take it seriously.
Last updated: 21 July 2026 · Applies to: the SEO Merlin WordPress plugin, free and premium editions
Summary
- The free edition is GPL v2 or later. Use it, modify it, redistribute it.
- The premium edition’s PHP code is also GPL v2 or later. What you buy is a licence to receive updates, support, and premium functionality on a set number of sites.
- Bundled assets — images, fonts, compiled JavaScript, and stylesheets — are covered by their own licences, listed below.
If that seems contradictory, it isn’t. The GPL governs the code. Your commercial licence governs the service around it.
1. Free edition
The free edition of SEO Merlin is licensed under the GNU General Public License, version 2 or (at your option) any later version.
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 2 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.
Full text: gnu.org/licenses/gpl-2.0.html
2. Premium edition
What you are buying
A premium licence grants you, for as long as the licence is active:
- the right to install and activate the premium edition on the number of sites your plan specifies;
- access to premium features;
- software updates, including security updates;
- email support.
Site allowances
| Plan | Sites |
|---|---|
| Free | 1 — capped at 10 AI fixes |
| Pro | 1 |
| Freelancer | 5 |
| Agency | 10 |
Each activation consumes one seat. Deactivate a licence from a site you no longer use to free the seat. Current prices are on the Pricing page.
The code itself
The premium edition’s PHP code is licensed under the GPL v2 or later, as WordPress requires of anything that runs inside it.
This means you have the freedoms the GPL grants over that code. It does not mean your licence key, your update access, or your support entitlement may be shared — those are services, not code, and they are governed by your commercial licence and the Freemius agreement.
What is not permitted
- Reselling or redistributing the premium edition as your own product.
- Sharing, publishing, or reselling your licence key.
- Removing, disabling, or circumventing licensing functionality.
- Using a single licence on more sites than your plan allows.
Doing any of these may result in termination of your licence without refund.
3. Where purchases happen
Premium licences are sold by Freemius, Inc., acting as merchant of record. The purchase contract is between you and Freemius on our behalf, under their End User License Agreement.
That agreement governs payment, billing, renewals, and refund eligibility. Our Refund Policy sets out the vendor-side position that agreement refers to.
4. Bundled third-party components
SEO Merlin ships with the following, each under its own licence:
| Component | Purpose | Licence |
|---|---|---|
| Inter | Interface typeface | SIL Open Font License 1.1 |
| JetBrains Mono | Monospaced typeface for URLs and figures | SIL Open Font License 1.1 |
| DejaVu Sans | PDF report typeface | Bitstream Vera / public domain elements |
| Dompdf | PDF generation | LGPL v2.1 |
| React and associated libraries | Administration interface | MIT |
| Freemius SDK | Licensing and updates | GPL v3 |
Each component’s full licence text ships inside the plugin package.
5. Your content
Everything the plugin produces on your site — generated text, structured data, reports — is yours. We claim no rights over your content, and we cannot access it.
Where content is generated by an AI service under your own API key, your rights in that output are determined by your agreement with that provider.
6. Warranty
The software is provided without warranty, as set out in the GPL text above and in our Terms of Use. Nothing here limits rights you have under consumer protection law that cannot be excluded by agreement.
7. Contact
CARPEBO SINGLE MEMBER P.C.
2nd km Xanthis–Lagous, Xanthi, Greece
Company Registration Number: 161870546000
The rest of the legal set
Four documents, all written in the same plain language. The Terms cover your agreement with us; the Privacy Policy covers what data goes where.