Catch the Butterfly: Peeking into the Terms and Conflicts among SPDX Licenses

• URL: http://arxiv.org/abs/2401.10636v1
• Date: Fri, 19 Jan 2024 11:27:34 GMT
• Title: Catch the Butterfly: Peeking into the Terms and Conflicts among SPDX Licenses
• Authors: Tao Liu, Chengwei Liu, Tianwei Liu, He Wang, Gaofei Wu, Yang Liu, Yuqing Zhang
• Abstract summary: Third-party libraries (TPLs) in software development has accelerated the creation of modern software. Developers may inadvertently violate the licenses of TPLs, leading to legal issues. There is a need for a high-quality license dataset that encompasses a broad range of mainstream licenses.
• Score: 16.948633594354412
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: The widespread adoption of third-party libraries (TPLs) in software development has accelerated the creation of modern software. However, this convenience comes with potential legal risks. Developers may inadvertently violate the licenses of TPLs, leading to legal issues. While existing studies have explored software licenses and potential incompatibilities, these studies often focus on a limited set of licenses or rely on low-quality license data, which may affect their conclusions. To address this gap, there is a need for a high-quality license dataset that encompasses a broad range of mainstream licenses to help developers navigate the complex landscape of software licenses, avoid potential legal pitfalls, and guide solutions for managing license compliance and compatibility in software development. To this end, we conduct the first work to understand the mainstream software licenses based on term granularity and obtain a high-quality dataset of 453 SPDX licenses with well-labeled terms and conflicts. Specifically, we first conduct a differential analysis of the mainstream platforms to understand the terms and attitudes of each license. Next, we propose a standardized set of license terms to capture and label existing mainstream licenses with high quality. Moreover, we include copyleft conflicts and conclude the three major types of license conflicts among the 453 SPDX licenses. Based on these, we carry out two empirical studies to reveal the concerns and threats from the perspectives of both licensors and licensees. One study provides an in-depth analysis of the similarities, differences, and conflicts among SPDX licenses, revisits the usage and conflicts of licenses in the NPM ecosystem, and draws conclusions that differ from previous work. Our studies reveal some insightful findings and disclose relevant analytical data, which set the stage for further research.

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