http://blogs.mysql.com/kaj/2008/05/06/mysql-server-is-open-source-even-b...

Kaj Arno blogs about MySQL Server remaining completely open source, including the backup and encryption extensions. This is a much more positive communication than what was previously stated after MySQL AB announced it was being acquired by Sun. ( http://www.mysql.com/news-and-events/sun-to-acquire-mysql.html )

MySQL is a very popular database server run on Linux and other platforms often referred to as the L.A.M.P. stack. http://en.wikipedia.org/wiki/LAMP_(software_bundle)