https://www.mysql.com/
MySQL open source software is provided under the GPL License.
OEMs, ISVs and VARs can purchase commercial licenses.
MySQL Community Edition is a freely downloadable version of the world‘s most popular open source database that is supported by an active community of open source developers and enthusiasts.
https://dev.mysql.com/downloads/mysql/
原文：http://www.cnblogs.com/hbuwyg/p/7191241.html