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MySQL is distributed under GPL v2, but there are some licensing exceptions
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that allow the client libraries to be linked with a non-GPL application,
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so long as the application is under a license approved by Oracle.
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For details see
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http://www.mysql.com/about/legal/licensing/foss-exception/
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Some innobase code from Percona and Google is under BSD license.
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Some code related to test-suite is under LGPLv2.