This is a comparison of published free software licenses and open-source licenses. The comparison only covers software licenses with a linked article for details, approved by at least one expert group at the FSF, the OSI, the Debian project, or the Fedora project. For a list of licenses not specifically intended for software, see List of free content licenses.
Contents
FOSS licenses
FOSS stands for "Free and Open Source Software". There is no one universally agreed-upon definition of FOSS software and various groups maintain approved lists of licenses. The Open Source Initiative is one such organization keeping a list of open-source licenses. The Free Software Foundation maintains a list of what it considers free. FSF's free software and OSI's open-source licenses together are called FOSS licenses. Due to some seldom conflicting cornercases technically not synonymous, for all practical considerations they are identical and widely used interchangeably.
The FSF's Free Software definition focuses on the user's unrestricted rights to use a program, to study and modify it, to copy it, and redistribute it for any purpose, which are considered by the FSF the four essential freedoms. The OSI's open-source criteria focuses on the availability of the source code and the advantages of an unrestricted and community driven development model. Yet, many FOSS licenses, like the Apache license, and all Free Software licenses allow commercial use of FOSS components.
General comparison
The following table compares various features of each license and is a general guide to the terms and conditions of each license. The table lists the permissions and limitations regarding the following subjects:
Approvals
This table lists for each license what organizations from the FOSS community have approved it – be it as a "free software" or as an "open source" license – , how those organizations categorize it, and the license compatibility between them for a combined or mixed derivative work. Organizations usually approve specific versions of software licenses. For instance, a FSF approval means that the Free Software Foundation (FSF) considers a license to be free software license. The FSF recommends at least "Compatible with GPL" and preferably copyleft. The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL.