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By Sebastien Hayez. Published September 17, 2024

Open SIL License: A Closer Look at What It Means and Why It Matters

Open-source software has completely transformed how we approach technology, making it easier than ever for people to collaborate and innovate together. 

I remember the first time I stumbled upon an open-source project—I was trying to customize a website for a friend and discovered that I could use free code shared by others. It blew my mind that so many talented people were offering their work to the world, just so others could build on it. At the core of this open-source movement are licenses that allow us to share, modify, and use software freely.

One license that really stands out, particularly in the world of font design, is the Open SIL License, also known as the SIL Open Font License. Recently, the release of Server Mono, a new open-source monospaced font designed specifically for developers, has garnered attention. Licensed under the SIL Open Font License, Server Mono is a perfect example of how this license can empower creators to share their work freely while ensuring it remains accessible to everyone. This article will break down what the Open SIL License is, why it was created, and why it’s important—even if you’re not a tech expert.

-> Download Server Mono


What is Open Source Licensing?

Before we dive into the specifics of the Open SIL License, let’s take a step back and talk about open-source licensing in general. When developers create software, they often want others to use, improve, and share it. To make this possible, they use open-source licenses, which are like rules that say, “You can use this software, but here’s how.”

There are different types of open-source licenses. Some are very flexible, allowing people to do almost anything they want with the software. Others are a bit stricter, requiring that any changes or improvements made to the software also be shared with the community.


What is the Open SIL License?

This license was created specifically for fonts by SIL International, an organization focused on language and literacy. Fonts are a unique kind of software because it’s used by softwares, and the Open SIL License was designed to help font designers share their work with the world while still maintaining some control over how their fonts are used.

The Open SIL License is all about balance. It allows people to use and share fonts freely, but it also includes some important guidelines to protect the original designers.


The Key Points

1. Free to Use and Share

The Open SIL License allows anyone to use, modify, and share the fonts covered by it. This means you can use these fonts in your personal projects, share them with friends, or even include them in commercial products.

2. Modify and Create New Fonts

If you’re a designer, you can take a font licensed under the Open SIL License, make changes to it, and even create a brand-new font. The only catch is that if you share your new font, it must also be under the Open SIL License. This ensures that the new font remains open and available to others.

3. No Selling of Original Fonts

One unique aspect of the Open SIL License is that it doesn’t allow people to sell the original, unmodified fonts. You can sell a modified version or use the font in something you sell, but you can’t just take the original font and sell it as-is. This rule helps prevent people from profiting off someone else’s hard work without adding something of their own.

4. Credit Where It’s Due

When you share a font covered by the Open SIL License, you need to give credit to the original designer. This is a simple way to acknowledge their work and keep the community spirit alive.

5. Embedding Fonts

The Open SIL License also allows fonts to be embedded in documents or software, as long as those documents or software are also freely shareable. This is especially useful for anyone working on digital projects.


Why the Open SIL License Matters

The Open SIL License has become popular in the world of typography and font design for a few key reasons:

1. Encouraging Creativity
By allowing people to freely use and modify fonts, the Open SIL License fosters creativity. Designers can experiment with new ideas and build on existing fonts, leading to a rich diversity of typefaces.

2. Supporting Language and Culture
This license is particularly important for projects that focus on preserving languages and cultural heritage. It allows for the creation and sharing of fonts that support less common languages, making it easier to represent these languages in digital and print media.

3. Making Fonts Accessible
The Open SIL License helps make high-quality fonts accessible to everyone. Many specialized fonts can be expensive, but those under the Open SIL License are free to use, helping to level the playing field for designers and users alike.

4. A Fair Deal for Designers
The Open SIL License strikes a fair balance. Designers get to share their work with the world, knowing that their contributions will be acknowledged and that others can’t simply profit off their work without adding something new.


The Open SIL License may not be as well-known as some other open-source licenses, but it plays a crucial role in the world of font design. It offers a thoughtful balance between openness and protection, allowing designers to share their fonts widely while keeping some control over how their work is used.

Whether you’re a designer, a developer, or just someone who appreciates good typography, the Open SIL License is a great example of how open-source principles can be applied in creative and meaningful ways. It’s a license that encourages innovation, supports language preservation, and makes the world of fonts a little more accessible to everyone.