Using Open-Source Code in Your Commercial Product
Your developer finds an open-source library that solves in an afternoon what might otherwise take a week to build.
Can you use it in a commercial product?
Often, open-source software can be used commercially. But “open source” does not mean “no rules.”
The relevant question is what the particular license permits and what conditions come with that permission.
What Founders Need to Know
An open-source license grants specified rights to use, modify, or distribute software subject to the conditions contained in that license.
Those conditions can vary substantially.
A permissive license generally allows broad use, modification, and distribution with relatively limited requirements, although the specific license terms still need to be followed.
A copyleft license can impose additional conditions designed to preserve specified freedoms when covered software or certain derivative works are distributed. Depending on the particular license and how the code is used, those conditions can raise important questions for a company distributing proprietary software.
The practical point is simple: two pieces of freely available code can carry very different obligations.
What This Looks Like in Practice
Imagine your startup is preparing to launch a commercial software product.
One engineer incorporates several open-source libraries. The team chose them because they were widely available, well documented, and free to download.
Months later, the company begins diligence for a financing.
The investor asks for a list of the open-source software incorporated into the product and the licenses governing it.
Your engineering team discovers that most components use permissive licenses with relatively straightforward requirements.
One component, however, uses a copyleft license.
Now the team has to determine exactly how that component was incorporated, how the product is distributed, and what obligations the particular license may trigger.
The issue is not that the company used open-source software. Open-source components are common throughout commercial technology.
The problem is that nobody tracked which licenses entered the codebase or evaluated their conditions when the code was added.
What took an engineer minutes to install may now require considerably more work to investigate during a financing.
Three Common Founder Mistakes
- Assuming “free” means unrestricted. No purchase price does not mean no license conditions.
- Treating every open-source license as equivalent. Different licenses can impose materially different requirements.
- Waiting until diligence to create an inventory. It is much easier to understand why and how a component was incorporated when the developer who selected it is still working on the product.
10-Minute Founder Self-Check
Ask your technical team:
- Do we maintain a list of open-source components in our product?
- Do we know which license applies to each one?
- Are any components governed by copyleft licenses?
- How are those components incorporated into the product?
- Do we distribute software containing open-source components?
- Are there attribution or notice requirements?
- Have we modified any open-source code?
- Do we have a process for reviewing new components before developers add them?
- Could we produce an accurate open-source inventory during diligence?
What to Do Next
You do not need to avoid open source. You need to know what is in your product and the conditions attached to it.
Create an inventory of material open-source components, identify their licenses, and establish a process for reviewing new dependencies before they become embedded in the product.
Book a Discovery Call with Primum Law Group to discuss your needs and concerns: https://calendly.com/primumlaw/30min?month=2026-08