Free Software

Public domain software Copyleft software Not Copyleft software software GPL References: Categories of Free and Non-Free Software <http://www.gnu.org/philosophy/categories.html> <http://www.fsf.org/philosophy/categories.html> Some Confusing or Loaded Words and Phrases that are Worth Avoiding <http://www.gnu.org/philosophy/words-to-avoid.html> <http://www.fsf.org/philosophy/words-to-avoid.html> Chao-Kuei, FSF.