permissioned blockchain is a distributed ledger that is not publicly accessible. It can only be accessed by users with permissions. The users can only perform specific actions granted to them by the ledger administrators and are required to identify themselves through certificates or other digital means. ADM

You might consider the addition of permissioned users as an extra blockchain security system. Administrators maintain an access control layer to allow certain actions to be performed only by certain identifiable participants. Records are kept within the blockchain of who is involved in the transactions. This makes permissioned IN blockchains different from public blockchains.