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Does open source mean you can use software without conditions?
No. An open-source license grants permissions, but those permissions come with terms. The GNU GPL, for example, grants rights to copy, distribute, and modify software subject to license conditions. Open source is therefore not the same as public domain, and “free” does not mean “no obligations.”
Before using a component, identify its exact license and version. Check what the terms require for your intended use, especially if you plan to modify or redistribute the software. A license may address attribution, retaining notices, sharing source code, patents, and warranty disclaimers. Do not assume that one license’s terms apply to all open-source software.
Can you use GPL code in a proprietary product?
It depends on how the GPL-covered code is combined with the rest of the product and how the product is delivered. GPL licenses impose reciprocal conditions in some distribution scenarios involving covered code and derivative works; that does not justify a blanket claim that every use of GPL code automatically makes an entire product GPL-licensed.
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The GNU GPL FAQ distinguishes library-linking and distribution scenarios from network-server use. That distinction is a reason to examine the actual architecture, license version, and delivery model—not a guarantee that any particular server-based use is exempt. If a product release depends on this interpretation, get advice from qualified counsel before shipping.
Does linking to a GPL library make your whole app GPL?
Not automatically in every case. The outcome can depend on how the application and library are combined, whether the result is a covered derivative work, and whether it is distributed. The GNU GPL FAQ addresses library linking in the context of particular scenarios, rather than supporting a universal rule that all linking changes the license of an entire application.
Map the components and how they interact, then assess the applicable GPL version and distribution plan. If the boundary between the application and library is material to your business model, do not rely on a slogan or a generic compatibility chart; ask a qualified lawyer to evaluate the specific design.
Are Apache-2.0 and GPL compatible?
Compatibility depends on the GPL version and the direction in which you combine the code. 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 requirements found in Apache-2.0.
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| Combination | What the Apache Software Foundation says |
|---|---|
| Apache-2.0 code included in a GPLv3 project | Compatible in this direction: “Apache 2 software can therefore be included in GPLv3 projects.” |
| Apache-2.0 and GPLv2 | Not compatible, according to the Apache Software Foundation, because GPLv2 does not include requirements Apache-2.0 imposes. |
These statements do not establish a universal yes-or-no answer for every combination. Check the exact license versions, how code is combined or modified, and how the result will be distributed. Compatibility is not a property you can infer just from the words “Apache” and “GPL.”
Do you have to give back changes to MIT or Apache code?
There is no general rule that every modification to open-source software must be contributed upstream. Permissive licenses can allow proprietary redistribution while still requiring compliance with their notice terms. For Apache-2.0 specifically, the Apache Software Foundation FAQ says, “You can keep your changes a secret if you like.” That does not remove the obligations that apply if you redistribute the software.
For any component, read its actual license rather than assuming that all permissive licenses have identical requirements. Keep required notices and observe other applicable terms when redistributing. Whether a specific change must be shared can depend on the license and how the software is used and delivered.
How do you track licenses in your dependencies?
Track licenses as part of managing the software you ship, not as a final check after release. An SPDX short-form identifier gives a concise way to state which license applies to a source-code or documentation file. Use the exact identifier, such as Apache-2.0, and record the license version for each component.
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- Inventory direct dependencies. Record each component’s name, version, license identifier, and where it is used.
- Include transitive dependencies. Inventory the components brought in by your direct dependencies, not only packages your team selected itself.
- Verify license evidence. Compare declared identifiers with the component’s license text and retain the notices required for redistribution.
- Check the combination and delivery model. Review compatibility, modifications, and any source-code or other conditions that may apply to the way you distribute or provide the software.
- Keep the inventory current. Recheck it when dependency versions or distribution plans change, and make license review part of release compliance.
The Linux Foundation’s enterprise open-source compliance handbook treats this tracking as part of a broader compliance process. A short identifier is useful for inventory, but it is not a substitute for reading the applicable license terms.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can a license translation tell you?
A translation may help readers understand a license, but it may not control its legal interpretation. The Apache Software Foundation says its translations are provided for convenience and that the English text remains authoritative for legal interpretation. Check the license version and the relevant jurisdiction before treating a translation as definitive.
What open-source licenses do not settle
A software license is not a complete answer to every legal question about a product. Copyright permission under a license does not by itself resolve separate trademark, patent, export, privacy, or contractual issues. For a commercial release, disputed interpretation, or consequential licensing decision, consult qualified counsel familiar with the software and the relevant jurisdiction.
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