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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/</ref>
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"'''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]</ref>
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"'''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>
    
==References==
 
==References==
 
<references/>
 
<references/>
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