ISC License
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| ISC License | |
|---|---|
| Name | ISC License |
| Author | Internet Systems Consortium |
| Introduced | 1990s |
| Spdx | ISC |
ISC License The ISC License is a permissive software license originating with the Internet Systems Consortium and used for free software distribution, modification, and redistribution with minimal restrictions. It is widely adopted in projects maintained by organizations such as the OpenBSD Project, the FreeBSD Project, and the NetBSD Foundation, and is recognized by entities including the Open Source Initiative and the Software Freedom Conservancy for its simplicity and permissive scope.
Overview
The ISC License is a concise, permissive software license crafted to provide developers freedom to use, copy, modify, and distribute software while disclaiming warranties. It functions alongside other permissive licenses from notable institutions such as the Massachusetts Institute of Technology, the University of California, Berkeley, and the Free Software Foundation's permissive offerings. The license text is often preferred in repositories managed on platforms like GitHub, GitLab, and Bitbucket due to its brevity and compatibility with package ecosystems including npm, PyPI, and CRAN.
Terms and Conditions
The ISC License typically grants broad rights to "use, copy, modify, and distribute" software and requires preservation of a copyright notice and permission notice in all copies. It includes a warranty disclaimer echoing principles upheld in cases before courts such as the United States Court of Appeals for the Ninth Circuit and doctrines influenced by decisions from the Supreme Court of the United States. The obligations imposed are minimal compared with copyleft instruments promulgated by organizations like the Free Software Foundation and the GNU Project, and it omits conditions found in licenses overseen by the European Union Intellectual Property Office or codified in statutes such as the Berne Convention.
Compatibility and Comparison with Other Licenses
Compared with the MIT License and the BSD licenses—including the 2-clause BSD and 3-clause BSD—the ISC License is shorter and removes certain attribution or advertising clauses seen historically in licenses associated with entities like the University of California, AT&T, and the University of Illinois. It is considered compatible with copyleft licenses like the GNU General Public License under specific redistribution models addressed in guidance from bodies such as the Open Source Initiative and legal analyses performed by firms including Software Freedom Law Center and Electronic Frontier Foundation. Projects governed by foundations like the Apache Software Foundation or standards bodies like the IETF often evaluate ISC compatibility alongside the Apache License 2.0 and Mozilla Public License.
Adoption and Notable Use Cases
The ISC License has been adopted by projects from the Internet Systems Consortium itself, and by implementations associated with the OpenBSD Project, the FreeBSD Project, the NetBSD Foundation, and networking stacks used in products by vendors such as Cisco Systems and Juniper Networks. Language runtimes and tooling in ecosystems overseen by Python Software Foundation, Node.js Foundation, and the Ruby Foundation have included ISC-licensed modules. Notable software distributions and package maintainers on platforms like Debian, Fedora Project, and Arch Linux include ISC-licensed components in their repositories.
Legal Considerations and Interpretations
Interpretation of the ISC License involves contract and intellectual property principles adjudicated in courts such as the High Court of Justice (England and Wales), the Supreme Court of Canada, and the United States District Court system when disputes arise over warranty disclaimers or attribution requirements. Legal advisors from firms and organizations like Harvard Law School clinics, the Electronic Frontier Foundation, and the Software Freedom Conservancy analyze ISC terms relative to statutes including the Copyright Act of 1976 (United States) and international treaties such as the Berne Convention to advise on enforceability. License compatibility analyses by the Open Source Initiative and counsel at corporations like Microsoft, IBM, and Google influence corporate adoption and risk assessments.
Historical Development and Maintenance
The ISC License emerged from the operations of the Internet Systems Consortium in the 1990s during the maturation of Internet infrastructure projects alongside contemporaneous developments at institutions such as the University of California, Berkeley (the birthplace of BSD derivatives) and the Defense Advanced Research Projects Agency. Its maintenance and textual updates have been discussed in forums frequented by participants from the Free Software Foundation, the Open Source Initiative, and developers active on mailing lists hosted by organizations like the IETF and repositories on SourceForge. Over time, stewardship and community guidance have been provided by advocacy groups including the Electronic Frontier Foundation and the Software Freedom Law Center to clarify application in modern software ecosystems.