Academic Free License 3.0A permissive license with explicit patent grant language, often discussed alongside OSL from the same author.Affero General Public License v1.0The earlier network-focused Affero copyleft that inspired the GNU AGPL line.Apache License 2.0A widely-used permissive license with an explicit patent grant, used across much of the open source ecosystem.Artistic License 2.0A flexible license balancing free redistribution with a structured approach to modified versions; common in Perl ecosystems.Boost Software License 1.0A short permissive license popular in C++ libraries because of its simplicity and explicit redistribution grant.BSD 2-Clause LicenseA simple permissive BSD license with attribution and disclaimer, but without the advertising clause.BSD 3-Clause LicenseThe common modern BSD license with attribution, disclaimer and a non-endorsement clause.BSD 4-Clause LicenseThe historical BSD license variant including the old advertising clause; less convenient, but important to archive.BSD Zero Clause LicenseAn extremely permissive “public-domain-like” BSD variant with essentially no conditions beyond warranty disclaimer.CeCILL 2.1French free software copyleft license aligned with European law and intended to remain GPL-compatible.CeCILL-CThe library-oriented weak-copyleft branch of the CeCILL family, roughly parallel to LGPL-style use cases.Common Development and Distribution License 1.0File-based weak copyleft license derived from MPL 1.1, used by projects such as OpenZFS and Illumos descendants.Common Development and Distribution License 1.1Updated CDDL revision retaining the same general file-level weak-copyleft structure.Creative Commons Attribution 4.0The standard permissive license for cultural works, documentation and open data. Any use is allowed as long as the author is credited.Creative Commons Attribution-NoDerivatives 4.0Allows redistribution with credit but forbids adaptations. Not a free-culture license; preserved here because many works depend on its exact text.Creative Commons Attribution-NonCommercial 4.0Allows sharing and adaptation for non-commercial purposes only. Not a free-culture license; preserved for the works that carry it.Creative Commons Attribution-NonCommercial-NoDerivatives 4.0The most restrictive Creative Commons license: redistribution only, non-commercial, no adaptations. Preserved for the works that carry it.Creative Commons Attribution-NonCommercial-ShareAlike 4.0Non-commercial sharing and adaptation under the same terms. Not a free-culture license; preserved for the works that carry it.Creative Commons Attribution-ShareAlike 3.0The previous ShareAlike generation, still carried by an enormous body of existing works — including years of Wikipedia history.Creative Commons Attribution-ShareAlike 4.0Copyleft for cultural works: adaptations must be shared under the same terms. The license of Wikipedia and much of the free culture movement.