Article 15aImplementation and enforcement

1. Member States shall lay down the rules on penalties, including criminal sanctions where appropriate, applicable to infringements of the national provisions adopted pursuant to this Directive and shall take all measures necessary to ensure that they are implemented. The penalties provided for must be effective, proportionate and dissuasive and may be applied to cover the period of any breach, even where the breach has subsequently been rectified. The Member States shall notify those provisions to the Commission by 25 May 2011, and shall notify it without delay of any subsequent amendment affecting them.

2. Without prejudice to any judicial remedy which might be available, Member States shall ensure that the competent national authority and, where relevant, other national bodies have the power to order the cessation of the infringements referred to in paragraph 1.

3. Member States shall ensure that the competent national authority and, where relevant, other national bodies have the necessary investigative powers and resources, including the power to obtain any relevant information they might need to monitor and enforce national provisions adopted pursuant to this Directive.

4. The relevant national regulatory authorities may adopt measures to ensure effective cross-border cooperation in the enforcement of the national laws adopted pursuant to this Directive and to create harmonised conditions for the provision of services involving cross-border data flows.

The national regulatory authorities shall provide the Commission, in good time before adopting any such measures, with a summary of the grounds for action, the envisaged measures and the proposed course of action. The Commission may, having examined such information and consulted ENISA and the Working Party on the Protection of Individuals with regard to the Processing of Personal Data established by Article 29 of Directive 95/46/EC, make comments or recommendations thereupon, in particular to ensure that the envisaged measures do not adversely affect the functioning of the internal market. National regulatory authorities shall take the utmost account of the Commission's comments or recommendations when deciding on the measures.