You'll need to log into the sourceforge cvs server. From a command line (terminal/shell prompt) do the following:

cvs -d:pserver:anonymous@dbreplicator.cvs.sourceforge.net:/cvsroot/dbreplicator login

when prompted for a password, just press <ENTER>. Then, do:

cvs -z3 -d:pserver:anonymous@dbreplicator.cvs.sourceforge.net:/cvsroot/dbreplicator co -P dbreplicator