Software Licenses, Free and Open Non-Free Software Source Software ● Non-free software is any software that is not free. Péter Jeszenszky – Its use, redistribution or modification is prohibited or Faculty of Informatics, University of Debrecen restricted, or requires permission.
[email protected] – It is also called as closed source software or proprietary software. Last modified: May 1, 2021 – Non-free software is the complementary set of free software. 3 Terminology Free Software ● Non-Free Software, Closed-Source Software, Proprietary Software ● The four essential freedoms: ● Free Software – ● Open-Source Software The freedom to run the program for any purpose. ● Free and Open-Source Software (FOSS) – The freedom to study how the program works. ● Commercial Software – The freedom to redistribute copies of the program. ● Freeware, Shareware – ● Software License The freedom to modify the program. ● End-User License Agreement (EULA) ● Access to the source code is a precondition for the ● License Compatibility second and the fourth freedom. ● Copyleft, Copyleft License ● ● Public Domain See: The Free Software Definition ● Dual Licensing, Multi-Licensing https://www.gnu.org/philosophy/free-sw.html.en 2 4 Open Source Software (1) Open Source Software (3) ● The terms “free software” and “open source software” ● Open Source Initiative (OSI) refer to almost the same range of software. However, https://opensource.org/ they represent two different approaches. – A non-profit organization founded 1998 to promote – Definition: The Open Source Definition and support open source software. https://opensource.org/docs/osd – Eric S. Raymond, a leading advocate of the open ● The term “open source” is more suitable for marketing source movement, was its president until 2005.