>>Does the fact that MySql is released with the GNU license mean our product must be open source also?
>>
>>Any suggestions and warnings regading MySql use?
>
>http://www.mysql.com/about/legal/licensing/oem/
>
>The FAQs are useful e.g. http://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySystem

I read that as "as long as they can be upgraded independently", i.e. the end user can load a newer version of MySql without even telling you, then it's surely separate.