MySQL Logo — MySQL is a database management system data relational, multi-threaded and multi-user with more than six million installations. a MySQL AB since January 2008, subsidiary of Sun Microsystems and this turn of Oracle Corporation since April 2009 — develops MySQL as free software in a dual licensing scheme.
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On one hand it offers under the GNU GPL for any use consistent with this license, but for companies that want to incorporate it into products proprietary to the company must purchase a special license that allows them to this use. It is developed mostly in ANSI C. Unlike projects like Apache, where software is developed by a public community and copyright of the code are held by the individual authors, MySQL is sponsored by a private company, which owns the copyright of most of the code. More