DataTerminology.comNEW
Also known as: OSS License
A legal license that grants rights to use, modify, and redistribute software under terms aligned with open source principles.
DESCRIPTION
An open source license sets the legal conditions for using, modifying, and sharing software’s source code. These licenses specify permissions, obligations, and limitations—balancing openness with compliance requirements like attribution or copyleft reciprocity. Common families include permissive (e.g., MIT, Apache 2.0) and copyleft (e.g., GPL) licenses. They enable collaboration, accelerate innovation, and govern how derivative works can be distributed. Organizations use license policies and scanning tools to ensure compliance and manage legal risk in supply chains. SPDX identifiers standardize license references in codebases and SBOMs.
ALTERNATIVE DEFINITIONS
Wikipedia
An open-source license is a type of license for computer software and other products that allows the source code, blueprint or design to be used, modified and/or shared under defined terms and conditions.
Highlights permissive reuse of source and designs under defined conditions.
Open Source Initiative
Open source licenses are licenses that comply with the Open Source Definition.
Grounds legitimacy in OSI’s formal Open Source Definition.
IBM
An open source license allows software to be freely used, modified, and shared, defining the terms under which collaboration happens.
Emphasizes collaboration and sharing enabled by licensing terms.
RELATED TERMS
Open Source Copyleft Permissive License GNU General Public License Apache License 2.0 MIT License SPDX License Compliance Dual Licensing Intellectual Property
COMPETING TERMS
Proprietary Software License
KNOWLEDGE AREAS
Software Engineering Platform & Tooling Data Privacy & Compliance
TARGET AUDIENCE
Software Developer Chief Technology Officer Chief Information Officer Data Privacy Officer IT Manager Data Management Consultant
EXTERNAL SOURCES
- Wikipedia - Open-source license
- Open Source Initiative - Authoritative Open Source Definition
- SPDX - License identifiers and SBOM standard
- GitHub - Guidance for selecting licenses
- Apache Software Foundation - Apache License 2.0 details
TOP QUESTIONS
Why is an Open Source License important for software projects?
It clearly defines rights and obligations for users and contributors, reducing legal ambiguity and enabling safe collaboration. Without a license, reuse is restricted by default.
Category: Relevancy
What is the difference between a permissive and copyleft Open Source License?
Permissive licenses allow proprietary derivatives with minimal conditions; copyleft requires derivatives to remain under similar open terms, preserving openness downstream.
Category: Requirements
How does an Open Source License affect commercial use?
Most open source licenses permit commercial use, but obligations like attribution or sharing modifications vary. Compliance ensures lawful distribution and avoids legal exposure.
Category: Risks
What is a common mistake with Open Source Licenses?
Mixing incompatible licenses in dependencies can create distribution conflicts. Always check license compatibility and use SPDX identifiers for clarity.
Category: Mistakes
How do organizations manage Open Source License compliance?
They use policies, SBOMs, and scanning tools (e.g., OpenSSF guidelines, SPDX) to track licenses, obligations, and export restrictions across dependencies.
Category: Management
What does copyleft mean in an Open Source License?
Copyleft requires that derivative works be licensed under the same or compatible open terms, ensuring modifications remain open and shareable.
Category: Definition
Is ‘public domain’ the same as an Open Source License?
No. Public domain dedicates works without restrictions, while open source licenses grant specific permissions and impose conditions like attribution.
Category: Misunderstanding
Which Open Source Licenses are most widely used today?
MIT, Apache-2.0, and GPL-3.0 are common. Choice depends on business goals, compatibility, and contribution model.
Category: Topic
How do dual licensing models relate to Open Source Licenses?
Dual licensing offers the same code under open and commercial terms, allowing flexibility for community adoption and revenue generation.
Category: Example