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BSD Licenses or the original BSD License and its two variants ? the Modified License (3-clause), and the Simplified License/FreeBSD License (2-clause) are a family of permissive free software licenses. Due to their permissive nature, they have very relaxed conditions about redistributing software licensed under them.

BSD licenses are a low restriction type of license for open source software that does not put requirements on redistribution. As a low restriction and requirement license type, Berkeley Source Distribution (BSD) licenses are used for the distribution of many freeware, shareware and open source software.

The Eclipse Public License (EPL) is a free and open source software license most notably used for the Eclipse IDE and other projects by the Eclipse Foundation. It replaces the Common Public License (CPL) and removes certain terms relating to litigations related to patents.

Being in the public domain is not a license; rather, it means the material is not copyrighted and no license is needed. Practically speaking, though, if a work is in the public domain, it might as well have an all-permissive non-copyleft free software license. Public domain material is compatible with the GNU GPL.

The BSD family of open source software licenses has a long history. The first version was created at UC Berkeley in 1980 to accompany the university's new UNIX-based operating system, the Berkeley Software Distribution, or BSD OS.

0 and GPL Compatibility. The Free Software Foundation considers the Apache License, Version 2.0 to be a free software license, compatible with version 3 of the GPL.

Many of the most common free-software licenses, especially the permissive licenses, such as the original MIT/X license, BSD licenses (in the three-clause and two-clause forms, though not the original four-clause form), MPL 2.0, and LGPL, are GPL-compatible.