OBS_VALUE: No restrictions on the infrastructural or physical type of vessels is found except that the vessel shall be qualified under the Greek safety legislation and the foreign crew shall have a Greek-language-knowledge certificate. A main concession contract is in place between the Hellenic Republic and the Organizations of Ports. The Hellenic Fund for the exploitation of the State's Private Property (TAIPED) may decide on the  sub-concession of port facilities for the ports of Alexandroupolis, Volos, Elefsina, Heraklion, Patras, Rafina to third parties. After the sub-concession contracts are granted by TAIPED, rights for use, administration and effective management continue to be executed by the Organizations of these Ports. The duration of the sub-concession is contingent on the duration of the main concession agreement. The sub-concession agreement is a triangle one (Port Organization, TAIPED, third party).See also unofficial version: https://www.e-nomothesia.gr/kat-naytilia--nausiploia/n-4150-2013.html AND http://www.taxheaven.gr/laws/law/index/law/328