> Hi Hirohama,
>
> Due to the fact that MySQL is licensed under a dual licensing system,
> you do not need to purchase a license of MySQL for using the database
> software for commercial use. You have a choice in the case that you
> don't like the terms of the GPL license[1], you can choose to license
> the software under a commercial license[2] from MySQL AB.
>
> For example you write a web interface to access data stored on a MySQL
> database, you do not need a license for MySQL, in terms of the GPL and
> you can freely utilise any version of MySQL which has been licensed
> under the GPL even if they change the license for future versions of
> MySQL you can continue to use the last version which was released under
> the GPL.
>
> Regards
> --jm
But, it would be a good idea to support the further development of the
database by contributing to MySQL either by donations or license fees.
Especially, if you like the product well enough to use it commercially.