São Tomé e Príncipe has two zones for petroleum resource management: the Joint Development Zone (JDZ) shared with Nigeria, and the Exclusive Economic Zone (EEZ). In the JDZ, four production sharing contracts have been signed for blocks 1, 2, 3, and 4, and exploration is underway. Revenue so far comes only from signature bonuses. The EEZ has not yet seen any petroleum activity but a legal framework is being approved to allow for exploration. São Tomé e Príncipe has also established a Revenue Management Law to ensure transparent and accountable use of future oil revenues through a National Oil Account.