The free software movement is a world wide effort that campaigns for the creation, use, and adoption of free software that entitles users to four essential freedoms:

• The freedom to run the program as they wish, for any purpose (freedom 0).
• The freedom to study how the program works, and adapt it to their needs (freedom 1). Access to the source code is a precondition for this.
• The freedom to redistribute copies so they can help their neighbor (freedom 2).
• The freedom to improve the program, and release their improvements to the public, so that the whole community benefits (freedom 3). Access to the source code is a precondition for this.

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