Open Source Basics

Open source software makes the underlying source code available for anyone to read, use, modify, and often redistribute. The term does not automatically mean free of cost, and it does not mean free of responsibility.

Most businesses unknowingly use open source software every day. Operating systems, web servers, databases, programming languages, security libraries, and developer tools are frequently open source. Your technology stack almost certainly depends on open source components maintained by unpaid volunteers or non-profit foundations.

Every open source project has a license. The license defines what users can and cannot do. Permissive licenses like MIT and Apache allow almost any use, including in proprietary products. Copyleft licenses like GPL require that derivative work also be open source under the same terms.

Using an open source component in a business product without understanding its license can create legal obligations. Most developer teams handle this well, but it is worth asking which licenses are in use, especially for commercial SaaS or products you plan to sell.

Open source projects range from individual side projects to foundations with corporate sponsors and thousands of contributors. Large projects like Linux, PostgreSQL, React, and Kubernetes have dedicated teams, governance structures, and release schedules.

Smaller projects may be maintained by one or two volunteers. A widely used library can become a single point of failure if its maintainer burns out, changes direction, or stops updating it.

Before adopting an open source project, look at how recently it was updated, how many active contributors it has, whether critical issues are addressed promptly, how large and active the community is, and whether commercial support or long-term support versions are available.

A project with no commits in two years, many unresolved issues, and one maintainer who has gone quiet is a risk. A project with regular releases, a responsive community, and corporate backing is likely more durable.

Businesses use open source in many ways: as the foundation for their own products, as ready-made tools for operations, as dependencies inside commercial software, and as infrastructure for development and deployment.

Understanding your dependencies helps you plan for updates, security patches, license changes, and end-of-life decisions. Most security vulnerabilities in modern software are discovered in open source libraries, and updates are usually fast. The risk comes from businesses that do not track their dependencies or apply patches.

Open source is like a recipe that anyone can read, cook from, and improve. Some recipes have rules: if you improve it, you have to share your version too. Others say: do whatever you want, just give credit.

Most restaurants use shared recipes for parts of their kitchen. Most software companies use open source components for parts of their product. The question is whether they know which recipes they are using and what obligations those recipes carry.

A startup builds a SaaS product and uses several open source libraries for database handling, authentication, and file uploads. Their developers know the code. Their legal team does not know the licenses.

At acquisition, the buyer discovers a GPL-licensed dependency whose terms may conflict with the commercial distribution model. A simple license audit early on would have surfaced this before it became a negotiation point.

Ask: Which open source components does our product or platform depend on? What are their licenses? Are any GPL or AGPL components embedded in commercial software? Who tracks dependency updates and security advisories?

Ask whether there is a software composition analysis process in place, or whether dependencies are only reviewed when something breaks.