Open Source License

Open weights means the model parameter files can be downloaded publicly, but it does not mean they can be used freely; it and open-source licenses (such as Apache 2.0 and MIT) are two different concepts.

Open-source licenses, by granting the rights to view, modify, and redistribute code, turn vendor lock-in risk from a commercial promise into a legal guarantee.

Having access to model weights does not imply the right to commercial use, redistribution, modification, or training of derivative models; one must read the license for that specific model and its variants.

Evaluating whether an open-source model can be used commercially requires checking the license text clause by clause, especially user scale limits, prohibited uses, and redistribution terms, as the term 'open-source' alone does not legally mean free commercial use.

Even if an open-source project mentions third-party licenses in its README, it still needs to add a license to the repository/project itself to cover its own original code.

A robust license review and attribution mechanism should be established when using third-party open-source code.

Open-source licenses give the community the fallback capability to continue a free version through forking

The open-source licensing mechanism is built on top of the copyright system, using the exclusive rights granted by copyright law to achieve open sharing; if copyright were completely abolished, licenses such as the GPL would lose their legal effect.

In the absence of an explicit license, code is protected by copyright by default, and others have no right to copy, modify, or distribute it.

Open-source models are typically released under Apache 2.0, MIT, or custom licenses that allow commercial use and modification, and operate under a different regulatory framework from hardware export controls.