University of Illinois/NCSA Open Source License

University of Illinois/NCSA Open Source License
Name	University of Illinois/NCSA Open Source License
Author	University of Illinois at Urbana–Champaign
Date	2003

University of Illinois/NCSA Open Source License The University of Illinois/NCSA Open Source License is a permissive free software license created at the University of Illinois at Urbana–Champaign and promulgated by the National Center for Supercomputing Applications. It provides a concise grant of rights and limited liability terms that have been applied to software developed in academic and research contexts such as NCSA Mosaic, MPICH, and other projects affiliated with research institutions and national laboratories. The license is often discussed alongside other permissive licenses like the MIT License, the BSD licenses, and the Apache License in comparative analyses by legal scholars and standards bodies.

Overview

The license grants downstream users rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the software while requiring preservation of copyright notices and disclaimers, similar to the approach taken by the BSD license (3-clause), the ISC license, and the MIT License. It limits attribution obligations to retention of notices and disclaims warranties and liability, echoing language found in agreements reviewed by organizations such as the Free Software Foundation and the Open Source Initiative. Its text is concise and designed for clarity for stakeholders including university technology transfer offices, corporate counsel at firms like IBM and Intel, and procurement teams at agencies such as the National Science Foundation.

Historical background and development

The license was drafted in the early 2000s at the National Center for Supercomputing Applications within the University of Illinois at Urbana–Champaign as part of efforts to modernize software distribution practices exemplified by projects like NCSA Mosaic and later contributions to high-performance computing software lines such as MPICH and Tcl. Its development reflects interactions among scholars and administrators linked to institutions including the Illinois Institute of Technology, the University of Chicago, and national initiatives funded by the U.S. Department of Energy. The license entered public circulation contemporaneously with revisions to permissive licensing promoted by entities such as the Free Software Foundation and the Open Source Initiative, and it has been incorporated into policy discussions at repositories like GitHub and package registries maintained by organizations like the Python Software Foundation and the Apache Software Foundation.

License terms and conditions

Key provisions require redistribution of the original copyright notice and disclaimer; this mirrors obligations found in the BSD license (2-clause), the ISC license, and the historical MIT License templates used by projects at Bell Labs and Xerox PARC. The license contains a warranty disclaimer and limitation of liability clause akin to statements enforced in litigation involving parties such as Oracle Corporation and Microsoft Corporation. It allows sublicensing and commercial distribution, which aligns it with permissive frameworks used by corporations like Red Hat and Canonical (company). The terms are brief enough to be reviewed by institutional legal teams at entities like the University of California system, the Massachusetts Institute of Technology, and national standards bodies including the Internet Engineering Task Force.

Compatibility and comparisons

Compatibility analyses often compare the license to the MIT License, the BSD licenses, and the Apache License for issues such as patent grants, attribution, and compatibility with the GNU General Public License. Unlike the Apache License which contains an explicit patent license clause advocated by legal teams at Google and Cisco Systems, the University of Illinois/NCSA text does not include an express patent irrevocable license, affecting interoperability with some versions of the GPL in certain legal readings endorsed by commentators from the Software Freedom Law Center and the Electronic Frontier Foundation. The license is generally accepted by the Open Source Initiative as permissive and is often treated as compatible with downstream proprietary relicensing strategies used by companies like Apple Inc. and Facebook.

Adoption and notable software using the license

Projects historically using this license include software originating at the National Center for Supercomputing Applications such as NCSA Mosaic derivatives and HPC middleware like MPICH variants, while research groups at institutions like the University of Illinois at Urbana–Champaign and collaborations with the Argonne National Laboratory have applied it to toolchains and libraries. The license has appeared in academic software distributions managed by consortia including the OpenStack Foundation contributors, and in codebases maintained on platforms such as GitHub and GitLab by contributors from companies like Intel and NVIDIA. It has also been used in educational software projects at the Massachusetts Institute of Technology and by teams collaborating with the Lawrence Berkeley National Laboratory.

Legal interpretation and enforcement

Legal interpretation focuses on the scope of rights granted, the sufficiency of notice preservation, and the warranty disclaimer, topics litigated or debated in cases and commentary involving parties like Oracle Corporation, Sun Microsystems, and technology licensors represented by firms such as Wilson Sonsini Goodrich & Rosati. Enforcement typically relies on contract and copyright law precedents from jurisdictions including courts in Delaware, the United States Court of Appeals for the Ninth Circuit, and academic analyses by scholars at the Harvard Law School and the University of Chicago Law School. Counsel often evaluate compatibility with patent strategies discussed in filings before the United States Patent and Trademark Office and in policy documents from the National Institutes of Health when advising research collaborations and spin-off companies.

Category:Software licenses