1. Member States shall respect the right of providers to provide services in a Member State other than that in which they are established.

The Member State in which the service is provided shall ensure free access to and free exercise of a service activity within its territory.

Member States shall not make access to or exercise of a service activity in their territory subject to compliance with any requirements which do not respect the following principles:

(a) non-discrimination: the requirement may be neither directly nor indirectly discriminatory with regard to nationality or, in the case of legal persons, with regard to the Member State in which they are established;

(b) necessity: the requirement must be justified for reasons of public policy, public security, public health or the protection of the environment;

(c) proportionality: the requirement must be suitable for attaining the objective pursued, and must not go beyond what is necessary to attain that objective.

2. Member States may not restrict the freedom to provide services in the case of a provider established in another Member State by imposing any of the following requirements: