It is EU law. The official name is “Council Regulation (EC) No 866/2004 of 29th April 2004 on a regime under Article 2 of Protocol 10 to the Act of Accession”. It entered into force on 1 May 2004. The Green Line Regulation lays down special rules concerning goods, services and persons crossing the line between the areas of the Republic of Cyprus in which the Government of the Republic of Cyprus exercises effective control and the areas of the Republic of Cyprus in which it does not.