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 change it so it does their computing as they wish (freedom 1). Access to the source code is a precondition for this.
• The freedom to redistribute copies so they can help others (freedom 2).
• The freedom to distribute copies of their modified versions to others (freedom 3). By doing this they can give the whole community a chance to benefit from their changes. Access to the source code is a precondition for this.

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