quote
The software available in MySQL Network and the MySQL Community
Edition is available under the "dual licensing" model. Under this
model, users may choose to use MySQL products under the free
software/open source GNU General Public License (commonly known as
the "GPL") or under a commercial license. ISVs and Resellers, who are
embedding and reselling the MySQL database server as part of their
own commercial solutions, can purchase a MySQL commercial license.
Please note that when you download the software below, it is the MySQL
Community Edition. MySQL Community Edition has not been certified and
is not considered ready for enterprise production use. It does,
however, provide a quick and easy way for open source developers and
technology enthusiasts to get started with MySQL. To receive
Certified Software that meets high levels of quality testing for
consistent uptime and fast performance, you will want to purchase
MySQL Network. MySQL Network includes MySQL Advisors that help
eliminate problems before they occur and production support directly
from MySQL support engineers worldwide. Learn more about the
differences between MySQL Community Edition and MySQL Network at
http://www.mysql.com/network/compare.html
unquote
HTH