Yo!!откуда ж вы такое взяли ? mysql это GPL без всяких но. для тех кому нада распространять mysql и GPL не подходит mysql выдумала свою комерческую лицензию.
я могу продавать свой комерческий продукт который юзает GPL mysql как бэкенд для данных, нельзя чтоб мой продукт был создан на основе mysql, т.е. на основе их исходников.

Со всякими НО:

http://www.mysql.com/company/legal/licensing/commercial-license.html

Цитата:
Typical examples of MySQL distribution include:

Selling software that includes MySQL to customers who install the software on their own machines.

Selling software that requires customers to install MySQL themselves on their own machines.

Building a hardware system that includes MySQL and selling that hardware system to customers for installation at their own locations.

Specifically:

If you include the MySQL server with an application that is not licensed under the GPL or GPL-compatible license, you need a commercial license for the MySQL server.

If you develop and distribute a commercial application and as part of utilizing your application, the end-user must download a copy of MySQL; for each derivative work, you (or, in some cases, your end-user) need a commercial license for the MySQL server and/or MySQL client libraries.

If you include one or more of the MySQL drivers in your non-GPL application (so that your application can run with MySQL), you need a commercial license for the driver(s) in question. The MySQL drivers currently include an ODBC driver, a JDBC driver and the C language library.