The concept of '''share-alike''' embraces and extends the earlier concept of "[[copyleft]]". The term "copyleft" is defined by the FSF as "a general method for making a program (or other work) [[free]], and | The concept of '''share-alike''' embraces and extends the earlier concept of "[[copyleft]]". The term "copyleft" is defined by the FSF as "a general method for making a program (or other work) [[free]], and |