This command allows you to block DCC (Direct Client to Client) session initiation; this has the effect of preventing the use of DCC over your server. You can selectively allow or disallow file transfers (dcc initiate file <enable|disable>), private chat sessions (dcc initiate chat
Example:
You would normally use this command if you wanted to disallow the use of DCC on your network, either to limit file transfers, or to limit private chat sessions.
/as security dcc set override enable