Article 6 2.

Member States may, to the extent justified by national security, public safety, public health, security of transport, protection of the environment, protection of biological resources and of national treasures possessing artistic, historic or archaeological value, safety of installations and of workers, planned management of hydrocarbon resources (for example the rate at which hydrocarbons are depleted or the optimization of their recovery) or the need to secure tax revenues, impose conditions and requirements on the exercise of the activities set out in Article 2 (1).