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All free software licenses must grant people all the freedoms discussed above. However, unless the applications' licenses are compatible, combining programs by mixing source code or directly linking binaries is problematic, because of license technicalities. Programs indirectly connected together may avoid this problem.
The majority of free software uses a small set of licenses. The most popular of these licenses are:
the GNU General Public License
the GNU Lesser General Public License
the BSD License
the Mozilla Public License
the MIT License
the Apache License
The Free Software Foundation and the Open Source Initiative both publish lists of licenses that they find to comply with their own definitions of free software and open-source software respectively.
List of FSF approved software licenses
List of OSI approved software licenses
The FSF list is not prescriptive: free licensees can exist which the FSF has not heard about, or considered important enough to write about. So it's possible for a license to be free and not in the FSF list. However, the OSI list is prescriptive: they only list licenses that have been submitted, considered and approved. This formal process of approval is what defines a license as Open Source. Thus, it's not possible for a license to be Open Source and not on the OSI approved list.
Apart from these two organizations, the Debian project is seen by some to provide useful advice on whether particular licenses comply with their Debian Free Software Guidelines. Debian doesn't publish a list of approved licenses, so its judgments have to be tracked by checking what software they have allowed into their software archives. That is summarized at the Debian web site.It is rare that a license is announced as being in-compliance by either FSF or OSI guidelines and not vice versa (the Netscape Public License used for early versions of Mozilla being an exception, as well as the NASA Open Source Agreement
The majority of free software uses a small set of licenses. The most popular of these licenses are:
the GNU General Public License
the GNU Lesser General Public License
the BSD License
the Mozilla Public License
the MIT License
the Apache License
The Free Software Foundation and the Open Source Initiative both publish lists of licenses that they find to comply with their own definitions of free software and open-source software respectively.
List of FSF approved software licenses
List of OSI approved software licenses
The FSF list is not prescriptive: free licensees can exist which the FSF has not heard about, or considered important enough to write about. So it's possible for a license to be free and not in the FSF list. However, the OSI list is prescriptive: they only list licenses that have been submitted, considered and approved. This formal process of approval is what defines a license as Open Source. Thus, it's not possible for a license to be Open Source and not on the OSI approved list.
Apart from these two organizations, the Debian project is seen by some to provide useful advice on whether particular licenses comply with their Debian Free Software Guidelines. Debian doesn't publish a list of approved licenses, so its judgments have to be tracked by checking what software they have allowed into their software archives. That is summarized at the Debian web site.It is rare that a license is announced as being in-compliance by either FSF or OSI guidelines and not vice versa (the Netscape Public License used for early versions of Mozilla being an exception, as well as the NASA Open Source Agreement
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