Disabling a user from publishing to CONNECT Portal

A Semi-Government organization is standardised on v8i platform. The team likes all the new features in MicroStation CONNECT except its ability to allow a user to publish and share files via Bentley Portal, as it is goes against their security policy. What are the different options available to block a MicroStationCONNECT user from publishing to Bentley Portal and and sharing the data?