A Data Sharing Agreement (DSA) is a contract among two or more principals regulating how they share data. Agreements are usually represented as a set of clauses expressed using the deontic notions of obligation, prohibition and permission. In this paper, we present how to model DSAs using the Event-B specification language. Agreement clauses are modelled as temporal-logic formulas that preserve the intuitive meaning of the deontic operators, and constrain the actions that a principal can execute.We have exploited the ProB animator and model checker in order to verify that a system behaves according to its associated DSA and to validate that principals' actions are in agreement with the DSA clauses.