What is considered an open source?

what is considered an open source: 97% adoption in 2026

what is considered an open source defines how developers share and modify software code. Misunderstanding these categories leads to legal liability or technical limitations for modern businesses. Learn the essential characteristics of these systems to protect your enterprise and ensure project success.

What exactly is considered open source?

At its core, open source is a decentralized model of production that allows anyone to inspect, modify, and redistribute a projects blueprints or source code. This approach relies on peer review and community collaboration rather than a single companys control. To be considered truly open source, a project must meet specific criteria for open source regarding free redistribution, access to the source code, and permission for derivative works.

In my ten years of managing software infrastructure, I have noticed that people often confuse open source with just being free of charge. It is a common mistake. I once deployed a free library for a client, only to realize later that the license forbade commercial use - a hard lesson that cost us three days of emergency refactoring. True open source is about freedom of usage, not just the price tag.

The Ten Pillars of the Open Source Definition

The standard for what qualifies as open source is maintained by the Open Source Initiative. They use a ten-point checklist to evaluate licenses. If a project does not meet every single one of these criteria, it is technically proprietary or source-available, but not open source. The most critical pillar is free redistribution: the license must not restrict any party from selling or giving away the software as a component of an aggregate software distribution.

The source code must be the preferred form for making modifications to the software. Deliberately obfuscated source code is not allowed. Furthermore, the license must allow modifications and derived works, and must allow them to be distributed under the same terms as the license of the original software. This ensures that the openness of the code is preserved as it evolves through different contributors.

No Discrimination and Technology Neutrality

A frequent point of confusion is whether open source can be used for evil or commercial purposes. The answer is yes. To be open source, the license cannot discriminate against persons or groups. It also cannot restrict anyone from making use of the program in a specific field of endeavor - whether that is genetic research or high-frequency trading. The license must be technology-neutral, meaning it cannot be predicated on any individual technology or style of interface.

Open Source vs. Freeware vs. Closed Source

Understanding the open source vs closed source differences between these categories is vital for anyone making a software decision. While 97% of codebases contain open source components,^[1] many users still struggle to tell it apart from freeware. Freeware is free to use but the code remains a black box. Closed source, or proprietary software, keeps the code hidden and limits usage through restrictive End User License Agreements (EULAs).

I have seen many small businesses choose freeware thinking they were getting the benefits of community security, only to find themselves stuck when the original developer stopped providing updates. With open source, you have the right to fork - if the original team disappears, you or a new community can take the code and keep it alive. This independence is a massive strategic advantage.

Common Misconceptions: Is Open Source Safe?

There is a persistent myth that making code public makes it easier for hackers. Actually, it is the opposite. Because the code is transparent, thousands of independent developers can spot vulnerabilities before they are exploited. Security researchers report that characteristics of open source projects can fix critical vulnerabilities faster than proprietary teams^[2] because they are not limited by a single companys internal headcount.

But here is the catch: security is a shared responsibility.

The many eyes theory only works if people are actually looking. I remember a case where a widely used library had a security flaw for years simply because everyone assumed someone else had checked it. Just because it is what is considered an open source does not mean it is automatically perfect. You still need to audit what you use. Total transparency is a tool, not a magic shield.

Software Distribution Models Compared

The way software is shared determines how much control you have over your technology stack. Here is how open source compares to other common models.

Open Source (e.g., Linux, Python)

• Full access to source code for inspection and modification

• High - the community can maintain the code indefinitely

• Usually free to use, but support and hosting may incur costs

• Allowed and encouraged under specific licenses

Proprietary / Closed Source (e.g., Windows, Photoshop)

• Hidden code; only the vendor can see or change it

• Depends entirely on the vendor's financial health

• Typically requires paid licenses or subscriptions

• Strictly prohibited; tied to specific users or machines

Freeware (e.g., Skype, Adobe Reader)

• No access to source code

• Low - if the developer quits, the software dies

• Free to use for the end-user

• Depends on individual author terms; usually limited

The Evolution of a Web Startup

Sarah, an IT lead at a fintech startup in Chicago, initially struggled with high licensing fees for proprietary database software that ate 15% of their initial seed funding. The team was frustrated - they felt locked into a contract that didn't allow for custom security extensions.

They decided to migrate to PostgreSQL, a famous open-source database. First attempt: their legacy system's specific character encoding caused the database to crash during the first data import. Sarah spent a week debugging, realizing their migration script ignored UTF-8 standards.

Instead of giving up, Sarah reached out to the global community and realized they needed to adjust the collation settings. She learned that open source isn't a 'plug and play' solution but a flexible framework that requires active understanding.

After 6 months, database performance improved by 40% and licensing costs dropped to zero. Sarah's team eventually contributed their character encoding fix back to the project, helping other developers avoid the same hurdle.