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If we can prevent the other people from access the compiled files from control builder, they will be prevent from access the data, am I right?
I would not bet money on that horse.
The MMS protocol supports ”discovery” e.g. the Control Builder M’s Remote System dialog can ”list” MMS Access Variables in any controller it can route traffic to.
Once you know the AV name you can read/write it.
I would isolate a controller from offenders with a NE87x router or by preventing physical access to the L2 subnet of the controller.