Unless you have some sort of super new controller, I don’t believe that the security classes will be handled in the controller. With the latest software from Sigma, this is done in the host, and with openHAB, it is also done in the host. I don’t think there is any controller firmware to handle the security CC in the controller.
I was recently discussing controller firmware with Aeon as I was looking for a version which included the new IMA features, and they told me that they are still shipping controllers with very old firmware. I will check with their developers though.
It is not used… My understanding of this is it’s just used as a store, and the binding does not use it. Again, if you have a new controller which handles the security in the controller itself, then maybe it is used, but as above, I’m not aware that this feature exists and I’ve not seen it in the latest SDK.