Article 19 2.

In line with the need to ensure the effective and efficient use of radio spectrum, or the implementation of the technical implementing measures adopted under Article 4 of Decision No 676/2002/EC, Member States may allow the restriction or withdrawal of rights of use for radio spectrum, including the rights referred to in Article 49 of this Directive, based on pre-established and clearly defined procedures, in accordance with the principles of proportionality and non-discrimination. In such cases, the holders of the rights may, where appropriate and in accordance with Union law and relevant national provisions, be compensated appropriately.