Restrictive Open Source License Template for the United States

A Restrictive Open Source License enables you to share your software code while maintaining meaningful control over how others use, modify, and distribute it. Unlike permissive open source licenses that grant broad freedoms, restrictive licenses implement specific limitations designed to protect your commercial interests, ensure proper attribution, or maintain control over derivative works under United States intellectual property law.

When do you need this document?

You need a Restrictive Open Source License when developing software that you want to share with the community while preserving certain rights or imposing specific obligations. This includes situations where you're creating proprietary software with open source components, developing educational or research software that requires attribution, or building commercial products where you want to prevent competitors from using your code in competing products. The license is also essential when your software incorporates patented technology that requires careful licensing terms, or when you need to ensure that modifications to your code remain available to the original project.

Key legal considerations

Several critical legal factors must be addressed when drafting your license. Copyright ownership and attribution requirements ensure proper recognition while protecting your intellectual property rights. Patent licensing clauses become crucial if your software incorporates patented methods or algorithms, as you need to clearly define what patent rights are granted alongside the copyright license. Copyleft provisions determine whether derivative works must be released under the same restrictive terms, helping maintain control over the evolution of your software. Liability limitations and warranty disclaimers protect you from legal claims arising from software use. Distribution restrictions may limit commercial use, require disclosure of source code modifications, or impose geographic limitations based on export control regulations.

Legal requirements in United States

Under United States law, your Restrictive Open Source License must comply with federal copyright law under the U.S. Copyright Act, which governs the exclusive rights you're licensing to others. State contract law principles apply to the enforceability of license terms, requiring clear language and proper acceptance mechanisms. If your software includes patented technology, the license must address patent rights under federal patent law to avoid conflicts between copyright and patent licensing. Export control regulations may restrict distribution to certain countries or entities, particularly for software with encryption capabilities. The Digital Millennium Copyright Act (DMCA) provides additional considerations for online distribution and takedown procedures. Your license should also address compliance with relevant industry standards and ensure compatibility with other open source licenses if your software incorporates third-party open source components.