Justification not yet generated — showing supporting facts

• The Free Software Foundation (FSF) defines free software as a matter of liberty rather than price, a definition adopted from Richard Stallman's work.
• The Free Software Foundation considers free software to be a subset of open-source software, noting that software like DRM-restricted software can be developed as open source but does not qualify as free software.
• Richard Stallman, leader of the Free software movement and member of the Free Software Foundation, opposes applying the term 'open source' to what he refers to as 'free software,' considering the equation of the two terms incorrect and misleading.
• To receive the 'Respects Your Freedom' certification from the Free Software Foundation, a seller must use FSF-approved terminology in all product-related publications, including packaging, manuals, web pages, and marketing materials. Specifically, the seller must use the term 'GNU/Linux' for any operating system including GNU and Linux, and must discuss 'free software' more prominently than 'open source'.
• The Free Software Foundation uses the term "free software," which predates "open source software" and emphasizes ethical freedoms associated with the software.
• Bruce Perens stated that he felt Eric Raymond's promotion of open-source unfairly overshadowed the Free Software Foundation's efforts and reaffirmed his support for free software.
• Joe Barr wrote an article titled 'Why "Free Software" is better than "Open Source"' for the Free Software Foundation in 1998.
• Richard Stallman argues that the 'Open Source' movement misses the point of 'Free Software' in an essay published by the Free Software Foundation.
• The Free Software Foundation (FSF) defines the 'Four Essential Freedoms' of free software as: (0) The freedom to run the program as you wish, for any purpose; (1) The freedom to study how the program works, and change it so it does your computing as you wish (access to source code is a precondition); (2) The freedom to redistribute copies so you can help others; (3) The freedom to distribute copies of your modified versions to others (access to source code is a precondition).
• The Free Software Foundation advocates for the free software model and suggests that users should think of 'free' as in 'free speech', not as in 'free beer'.
• The term 'Free and Open Source Software' encompasses both Free Software as defined by the Free Software Foundation and Open Source Software as defined by the Open Source Initiative.
• As of August 2017, the Free Software Foundation's definition of free software is published in 40 languages on the GNU Project website.