Free software

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Free software is software that respects the user's four essential software freedoms:

  1. The freedom to use the software for any purpose.
  2. The freedom to study how the software works and to modify it if you wish.
  3. The freedom to redistribute (e.g., sell, give away, share) exact copies.
  4. The freedom to distribute (e.g., sell, give away, share) your modified versions.