"Article 2 1. Member States shall grant the nationals referred to in Article 1 the right to leave their territory in order to take up activities as employed persons and to pursue such activities in the territory of another Member State. Such rights shall be exercised simply on production of a valid identity card or passport. Members of the family shall enjoy the same right as the national on whom they are dependent. … Article 4 … 2. As proof of the right of residence, a document entitled "