Quoting MySQL VP for Community Kaj Arnö:

  • MySQL Server is and will always remain fully functional and open source,
  • so will the MySQL Connectors, and
  • so will the main storage engines we ship.
  • MySQL 6.0’s pending backup functionality will be open source,
  • the MyISAM driver for MySQL Backup will be open source, and
  • the encryption and compression backup features will be open source,