Instructions on Subversion use can be found at http://svnbook.red-bean.com/.
CUBRID projects consist of many sub-projects such as CUBRID engine, CUBRID Tools, CUBRID APIs, and so on. Most of projects are leaded by developers in Korea and East Asia countries however some are co-maintained with European developers. Based on maintainers' preference and access speed, each repository can be located differently.
The latest version of CUBRID source code can be checked out anonymously from SVN branch with the following command:
svn checkout http://cubrid.svn.sourceforge.net/svnroot/cubrid/cubrid/branches/RB-<CUBRID VERSION> cubrid
<CUBRID VERSION> with the appropriate version number such as 8.4.1