The branches supported by the FreeBSD Security Officer have been updated to reflect the EoL (end-of-life) of FreeBSD 6.3.
Users of FreeBSD 6.3 are advised to upgrade promptly to a newer release, either by downloading an updated source tree and building updates manually, or (for i386 and amd64 systems) using the FreeBSD Update utility as
described in the relevant release announcement.
I have updated my FreeBSD Events & Conference Calendar to reflect these updates.
More info about security and supported branches: FreeBSD Security