Yes — MIT License commercial use is fully permitted. The MIT License lets you use, copy, modify, merge, publish, distribute, sublicense, and sell software that includes MIT-licensed code, including in closed-source commercial products, with essentially one obligation: you must preserve the original copyright notice and the license text. It is one of the most permissive and business-friendly open source licenses in existence. So yes, the MIT license is free for commercial use — there is no fee, no royalty, and no requirement to open-source anything you build with it. This guide explains the MIT license meaning in plain terms, the single condition you have to meet, and the edge cases that trip teams up.
What Is the MIT License, in Plain Terms?
The MIT License is a short, permissive open source license — the full text fits in a single paragraph plus a disclaimer. It originated at the Massachusetts Institute of Technology and has become the default license for a huge share of open source projects, including much of the JavaScript and npm ecosystem.
"Permissive" is the key word. Unlike copyleft licenses such as the GPL, the MIT License imposes almost no conditions on what you do with the code. It grants broad rights and asks for very little in return. The entire license grants permission to deal in the software "without restriction," subject to one requirement and one disclaimer.
What Does the MIT License Meaning Come Down To?
Cut through the legal phrasing and the MIT license meaning is three things:
- You get broad permission. Use, copy, modify, merge, publish, distribute, sublicense, and sell — the license lists these explicitly.
- You have one condition. The copyright notice and the permission (license) text must be included in all copies or substantial portions of the software.
- You get no warranty. The software is provided "as is." The authors are not liable for anything. This disclaimer is why the license protects the original authors, not you as the redistributor.
That is the whole deal. There is no requirement to open-source your changes, no requirement to use the same license for your own code, and no fee.
Can You Use MIT-Licensed Code in a Commercial Product?
Yes, without qualification. MIT license commercial use covers every commercial scenario people worry about:
- Selling software that includes MIT code — permitted.
- Bundling MIT code into a closed-source, proprietary product — permitted. You do not have to release your source.
- Modifying MIT code and keeping the modifications private — permitted.
- Using MIT code in a SaaS product — permitted (and unlike the AGPL, there is no network-use trigger to worry about).
- Relicensing your combined product under a different license — permitted, as long as the MIT-licensed portions still carry their original notice.
This is precisely why the MIT License is so common in commercial software: it removes the legal friction that copyleft licenses introduce. A startup can build a proprietary product on a foundation of MIT-licensed libraries without any obligation to open their own code.
What Is the One Thing You Must Do?
The single obligation is attribution. When you distribute software that contains MIT-licensed code — in source or binary form — you must include a copy of the original copyright notice and the MIT license text.
In practice this means:
- For a distributed application, include the license notices (often aggregated into a
LICENSES,NOTICE, or "third-party licenses" file, or an about screen). - For a library you redistribute, keep the
LICENSEfile intact. - For each MIT dependency, the specific copyright line ("Copyright (c) YEAR AUTHOR") must survive.
Strip the notice and you are in violation, even though every other freedom remains. This sounds trivial, and for one dependency it is. The complexity arrives at scale.
Why Is MIT Compliance Harder Than It Looks?
A modern application does not depend on one MIT library — it depends on hundreds, transitively. Each one may carry its own copyright notice that you are obligated to preserve. A single npm install can pull in a dependency tree where dozens of packages are MIT-licensed, each with a distinct copyright holder.
Meeting the attribution requirement then becomes an inventory problem: you need to know every open source component in your product, its license, and its notice text, and you need to bundle those notices with what you ship. Doing that by hand across a large dependency tree is error-prone, and it drifts every time you update a package.
This is where a software bill of materials and automated license scanning earn their keep. A software composition analysis tool inventories every dependency, records its license, and flags anything that is not what you expect — so you can generate the attribution file automatically and catch a surprise copyleft dependency before it ships. It also flags the inverse risk: a package that claims to be MIT but bundles code under a more restrictive license. For a broader map of how MIT sits among other license families, see the licensing guides in our academy.
FAQ
Can I sell software that uses MIT-licensed code?
Yes. The MIT License explicitly grants the right to sell the software, and it permits including MIT code in closed-source, proprietary, commercial products. Your only obligation is to preserve the original copyright notice and license text in what you distribute. You do not owe any fee or royalty.
Do I have to open-source my code if I use an MIT library?
No. The MIT License is permissive, not copyleft. Using, modifying, or bundling MIT-licensed code creates no obligation to release your own source code or to license your product under MIT. This is the key difference from GPL-style copyleft licenses.
What happens if I remove the MIT copyright notice?
You breach the license. The one condition the MIT License imposes is that the copyright notice and permission text accompany all copies or substantial portions of the software. Removing it makes your distribution unauthorized, even though the license is otherwise extremely permissive. Attribution is not optional.
Is the MIT License good for commercial use?
It is one of the best licenses for commercial use precisely because it is so permissive: broad rights, one lightweight attribution condition, no copyleft obligations, and no network-use trigger. The main operational challenge is tracking attribution across a large dependency tree, which is an inventory task, not a legal restriction.
Is Apache License 2.0 also free for commercial use?
Yes. Apache License 2.0 is also a permissive license that is free for commercial use — you can sell, modify, and bundle Apache-2.0-licensed code into proprietary products. The main practical difference from MIT is that Apache 2.0 adds an explicit patent grant and requires you to note any changes you made to the source, whereas MIT's only condition is preserving the copyright notice.