Are you trying to restrict models or trying to restrict zone access?
Zone access: 
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				(copy and paste from blackdragonsdg) 
You could also achieve this by locking out zones in the zone table. Setting the min_level = X where X is greater than the max level attainable on the server. Or you could set min_status = 250 so that only GM's and admins could access the zone. Or you could create a custom item that isn't available in the game world and make it the required key for the zones you want locked.
			
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