CreativeCommonsShareAlike
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http://creativecommons.org/licenses/sa/1.0/
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http://creativecommons.org/licenses/sa/1.0/legalcode
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ShareAlike 1.0
__sa__
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Share Alike. The licensor permits others to distribute derivative works only under a license identical to the one that governs the licensor's work.
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CreativeCommons