License Class: Mozilla Public Licenses (MPL); CPAL; Sun Public License (SPL)The Mozilla Public License (MPL) originated as a hybrid of the Berkeley Software Distribution (BSD) and the General Public License (GPL) licenses. It is considered, by the Free Software Foundation, to be a 'weak copyleft' license. Copyleft licenses - of which the General Public License (GPL) is the most commonly used - require any work originating in the licensed code to be made available under the same provisions.
Some additional facts regarding the license include:
- The Open Source Initiative (OSI) has approved this license as an Open Source license. Open Source approved licenses comply with the OSI criteria. Such criteria include provisions supporting both the free redistribution of aggregate and derived products, and the requirement that source code be made available with the distributions of aggregate and derivative products.
The Free Software Foundation (FSF) has classified this license as a
Free Software license. Free Software licenses meet the FSF's criteria
for supporting the user's freedom to run, study, redistribute and
improve the program.
- This license is a weak copyleft license. Copyleft licenses - of which the GPL is the most commonly used - require any work originating in the licensed code to be made available under the same provisions. Weak copyleft licenses are mainly used for software libraries. Other software can be linked with the weak copyleft licensed library, and then redistributed under a different license. Only changes to the actual copylefted software must be under the copyleft license.