Changes

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

requiring all modified and extended versions of the program to be free as well." <ref>http://www.gnu.org/copyleft/</ref>

requiring all modified and extended versions of the program to be free as well." <ref>[http://www.gnu.org/copyleft/ What is Copyleft?]</ref>

"'''Share-alike'''" works, unlike "copylefted" works, don't have to be free. For example, [[CC-BY-NC-SA]] is a share alike work which is not free. <ref>[http://robmyers.org/weblog/2008/02/noncommercial-sharealike-is-not-copyleft.html NonCommercial Sharealike Is Not Copyleft] by [[Rob Myers]]</ref>

"'''Share-alike'''" works, unlike "copylefted" works, don't have to be free. For example, [[CC-BY-NC-SA]] is a share alike work which is not free. <ref>[http://robmyers.org/weblog/2008/02/noncommercial-sharealike-is-not-copyleft.html NonCommercial Sharealike Is Not Copyleft] by [[Rob Myers]]</ref>