The Commercial View of MySQL
MySQL is an open source product and is available under the GNU Public License (GPL). Because of this, you can download MySQL and immediately start using it for free.
Under the GPL, can use MySQL for free on anything from your own desktop PC to a Web server with millions of visitors. Even if you're an ISP offering MySQL as a tool for Web site developers, you don't have to pay anything for it.
However, there are scenarios in which MySQL must be paid for. If you compile any part of the MySQL software into another application and distribute it, you must purchase a commercial license. A recent development is the capability to compile MySQL into an application as an embedded server; to distribute such a MySQL-powered application, ...
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