These commands control the list of rooms that cannot be created. If the room already exists, then people can join it. But if the room empties then nobody can enter it again until it is removed from the nochan list.
Example:
/as security nochan add #porn
You can use masks when creating prohibited channel names and all channels that match that mask will then be prohibited. Example: #porn*
This command deletes a specified prohibited channel.
Example:
/as security nochan del #porn
The mask must match exactly to a mask that was placed using the SECURITY NOCHAN ADD command. A wider mask will not delete masks that are contained in that mask.
Lists all prohibited channel names.
Example:
/as security nochan list