Free and open-source software licenses
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| Free and open-source software licenses | |
|---|---|
| Name | Free and open-source software licenses |
| Introduced | 1980s |
| Author | Various |
| License | Various |
Free and open-source software licenses are legal instruments that grant permissions for copying, modifying, and redistributing software, and they shape collaboration among projects such as Linux kernel, Apache HTTP Server, Mozilla Firefox, LibreOffice, and WordPress. These licenses interact with institutions like the Free Software Foundation, the Open Source Initiative, the Software Freedom Conservancy, and the Electronic Frontier Foundation, and they influence repositories such as GitHub, GitLab, SourceForge, and Debian. Their provisions are interpreted in courts and legislatures including the United States Court of Appeals for the Ninth Circuit, the European Court of Justice, and national bodies in Germany, India, and Brazil.
Overview and Definitions
Free and open-source software licenses define rights and obligations for authors, contributors, and users of code in projects like Kubernetes, GIMP, Blender, MySQL, and PostgreSQL. They distinguish between permissions such as redistribution, modification, and attribution, as seen in interactions among entities like the Free Software Foundation, the Open Source Initiative, the Mozilla Foundation, the Apache Software Foundation, and the Linux Foundation. Key terms are shaped by doctrines from courts such as the Supreme Court of the United States, the European Court of Human Rights, the High Court of Justice (England and Wales), and legal theories advanced by scholars affiliated with institutions like Harvard University, Stanford University, Oxford University, and MIT.
Types and Classifications of Licenses
Licenses are commonly classified into permissive, copyleft, and weak copyleft categories, with examples present in projects like BSD, MIT, GPL, LGPL, and MPL. Taxonomies used by organizations such as the Open Source Initiative and the Free Software Foundation inform package managers in ecosystems like Debian, Fedora, Ubuntu, Arch Linux, and Gentoo. Academic discussions in journals and conferences at ACM, IEEE, USENIX, and FOSDEM compare license families across codebases such as Apache HTTP Server, OpenSSL, SQLite, TensorFlow, and PyTorch.
Legal Principles and Compatibility
Principles such as copyright assignment, patent grants, warranty disclaimer, and license compatibility are central to disputes involving parties like Oracle Corporation, Google, Microsoft, Apple Inc., and Red Hat. Compatibility matrices are maintained by communities including Debian Project, Open Source Initiative, Free Software Foundation, and legal clinics at Harvard Law School, Stanford Law School, and University of California, Berkeley. High-profile cases and settlements involving entities such as SCO Group, Novell, Sun Microsystems, Facebook, and IBM have tested doctrines recognized by tribunals like the United States District Court for the Northern District of California and arbitration panels under rules like those of the International Chamber of Commerce.
Use Cases and Governance Models
Licenses govern contribution workflows in foundations and consortia such as the Apache Software Foundation, the Linux Foundation, the Eclipse Foundation, the Cloud Native Computing Foundation, and the KDE e.V.. They affect commercial strategies pursued by companies like Red Hat, Canonical, SUSE, Cloudera, and MongoDB, Inc., and nonprofit stewardship by organizations like the Software Freedom Conservancy and OpenJS Foundation. Governance models—meritocratic, benevolent dictator, foundation-led, and corporate stewarded—appear in projects such as Linux kernel, Python, Node.js, AngularJS, and Rust.
Major License Examples
Prominent licenses include the MIT, BSD, Apache 2.0, GPLv2, GPLv3, MPL 2.0, and LGPL. Each appears in major codebases like React, Chromium, Android, LibreOffice, Firefox, and OpenJDK. Stewardship and relicensing episodes have involved organizations and projects including Oracle Corporation, Sun Microsystems, Novell, Canonical, Debian Project, and OpenBSD.
Controversies and Criticisms
Debates over license choice and enforcement have implicated corporations, foundations, and governments including Microsoft, Google, Facebook, Amazon, European Commission, and United States Department of Justice. Controversies encompass relicensing disputes, compatibility conflicts, patent assertion theories, and license proliferation, as evidenced in incidents involving SCO Group, Oracle Corporation, OpenSSL, Node.js, and MongoDB, Inc.. Critics and defenders cite positions from advocacy groups and legal scholars at Free Software Foundation, Open Source Initiative, Electronic Frontier Foundation, Stanford Law School, and Harvard Law School regarding ethics, sustainability, and commercialization.