Citation:
Selling Products that use MySQL
To determine whether or not you need a MySQL license when selling your application, you should ask whether the proper functioning of your application is dependent on the use of MySQL and whether you include the MySQL server or clients with your product. There are several cases to consider:
If your product requires MySQL, you need a license for any machine that runs the mysqld server. For example, if you've designed your application around MySQL, then you've really made a commercial product that requires the engine, so you need a license.
You need a license if you sell a product designed specifically for use with MySQL or that requires the MySQL server to function at all. This is true whether or not you provide MySQL for your client as part of your product distribution.
It also depends on what you're doing for the client. Do you plan to provide your client with detailed instructions on installing MySQL with your software? Then your product may be contingent on the use of MySQL; if so, you need to buy a license.
apparement ya vraiment une dépendance et l'astuce de faire installer ça sous entend de donner des instructions non ?