(iii) Agreement to restrict legal privileges (§28): any agreement which completely prevents a party from asserting its contractual rights through ordinary legal proceedings before the ordinary courts or which limits the period within which it may assert its rights is therefore restricted. The exceptions to this rule are: (a) an agreement to refer to arbitration all future disputes related to a contract. (b) an agreement to refer all disputes in the case to arbitration in respect of a contract. (c) an agreement that restricts the right of one of the parties to sue in a particular court. Invalid and liable agreement Invalid agreement: an agreement that is not enforceable by law is called a void agreement. An agreement not concluded has no legal effect and does not confer the right to do so on the parties.