No: “open source” does not mean “use it however you want.” The license grants permissions subject to conditions, and the conditions differ. Some licenses allow proprietary redistribution if required notices are retained; copyleft licenses can require source code and the same license when covered software is distributed. The result depends on the specific license, how components are combined, and how the software is delivered.
What permission does an open-source license actually give?
An open-source license is not the same as a dedication to the public domain. It sets terms for using, copying, modifying, and distributing software. Those terms can include preserving copyright and license notices, providing source code in certain circumstances, or licensing a derivative work under the same terms.
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Check the license that applies to the particular code and version you are using. A project name, repository label, or statement that software is “free” does not tell you all of its legal conditions. The SPDX identifier GPL-3.0-or-later, for example, identifies a GPL license choice; it is more precise than simply writing “GPL.”
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Can GPL code be used in a proprietary product?
It may be possible to use GPL-licensed code in a product that is otherwise proprietary, but distributing a combined or derivative work can trigger GPL obligations for the covered work. In particular, the GPL is not a general permission to distribute covered code in a proprietary form while withholding the source and disregarding the license conditions.
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The key distinction is between using software internally and conveying or distributing it to others. For a release, examine what is being distributed, how the components are combined, which GPL version applies, and what source-code and license terms that version requires. Do not assume that keeping your own application’s source private is compatible with every way of incorporating GPL code.
Does linking to a GPL library automatically make the whole app GPL?
There is no reliable one-line rule that every act of linking automatically changes the license of an entire application. The GNU GPL FAQ treats library linking as a question about the relationship between the components and the circumstances of distribution. How the program is combined and delivered matters; the conclusion cannot be determined from the word “linking” alone.
Network use also needs to be distinguished from distribution. The GPL and the GNU GPL FAQ discuss distribution scenarios separately from making software available through a network server. Do not infer a source-disclosure obligation—or the absence of one—merely because a program can be accessed online. Identify the exact license and version, the architecture and combination of the components, and what users receive or can access.
Are Apache-2.0 and GPL compatible?
Compatibility depends on the GPL version and the direction of combination. The Apache Software Foundation says, “Apache 2 software can therefore be included in GPLv3 projects.” It also explains that Apache-2.0 is not compatible with GPLv2 because GPLv2 lacks terms needed to accommodate requirements in Apache-2.0.
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That does not establish that every project containing Apache-2.0 and GPL code is compatible in every arrangement. Check the exact license versions and how the code is combined and distributed; “GPL” without a version is not enough to answer the question.
Do MIT or Apache-2.0 changes have to be contributed upstream?
Generally, these permissive licenses do not require you to publish private modifications or contribute them back to the original project. The Apache Software Foundation FAQ puts it plainly: “You can keep your changes a secret if you like.” That does not mean you can ignore the license when redistributing the software.
When distributing code, follow the specific license text. For Apache-2.0, that includes applicable notice and license conditions. Permissive does not mean condition-free, and this answer should not be carried over to copyleft licenses, which can impose reciprocal obligations on covered distributions.
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What should a license comparison actually check?
Do not reduce a license to a single “permissive” or “viral” label. For every component that matters to a release, check the license text and the way the component is used against the questions below.
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- Redistribution: Does the license allow distribution in your intended product and delivery model?
- Notices: Which copyright notices, license texts, or attributions must accompany the code or product?
- Source: Does this distribution trigger a requirement to provide source code or corresponding source?
- Scope: What work is covered by reciprocal terms, and does your way of combining components create a covered work?
- Patents: Does the license grant patent rights, and are there conditions or termination provisions?
- Compatibility: Are the exact license versions compatible for the specific combination and distribution?
- Delivery method: Are you distributing software, providing it over a network, or doing both?
- Other rights: Copyright permission does not by itself settle trademark, export, privacy, or separate contractual questions.
How do you track licenses in direct and transitive dependencies?
License review has to include more than the packages your team selected directly. Those packages can bring in transitive dependencies, each with its own license and notices. SPDX describes a short-form identifier as a simple way to state which license applies to a source-code or documentation file; use exact identifiers such as Apache-2.0 where they are established, and record the version being reviewed.
- Inventory the full dependency tree. Include direct and transitive packages, relevant versions, and the source or package location used to identify each one.
- Record license evidence. Capture the declared SPDX identifier when available and check the package’s included license text and notices rather than relying only on a repository label.
- Flag uncertainty and conflicts. Mark missing, ambiguous, or multiple license declarations for review; assess compatibility against your actual combination and distribution model.
- Preserve required notices. Gather the notices and license texts needed for the product’s redistribution and make sure they are included where required.
- Update the inventory as dependencies change. A package or version update can change the applicable license information, so review the inventory as part of release and dependency-update work.
The Linux Foundation’s enterprise open-source compliance handbook treats this kind of tracking as part of a compliance process, not as a one-time check of top-level dependencies. For a product release or a disputed interpretation, have qualified counsel review the actual components and distribution plan. This is general educational information, not individualized legal advice.
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