Davis & Ors v SSHD Judgment Approved by the court for handing down. Österreich EU:C:2013:28, paragraph EU:C:2013:661, paragraph 29). 50; and Case C 101/12 Schaible 49. With regard to judicial review of compliance with those conditions, where interferences with fundamental rights are at issue, the extent of the EU legislature’s discretion may prove to be limited, depending on a number of factors, including, in particular, the area concerned, the nature of the right at issue guaranteed by the Charter, the nature and seriousness of the interference and the object pursued by the interference (see, by analogy, as regards Article 8 of the ECHR, Eur. Court H.R., S. and Marper v. the United Kingdom [GC], nos. 30562/04 and 30566/04, § 102, ECHR 2008-V). 50. In the present case, in view of the important role played by the protection of personal data in the light of the fundamental right to respect for private life and the extent and seriousness of the interference with that right caused by Directive 2006/24, the EU legislature’s discretion is reduced, with the result that review of that discretion should be strict. 51. As regards the question of whether the retention of data is appropriate for attaining the objective pursued by Directive 2006/24, it must be held that, having regard to the growing importance of means of electronic communication, data which must be retained pursuant to that directive allow the national authorities which are competent for criminal prosecutions to have additional opportunities to shed light on serious crime and, in this respect, they are therefore a valuable tool for criminal investigations. Consequently, the retention of such data may be considered to be appropriate for attaining the objective pursued by that directive. 52. That assessment cannot be called into question by the fact relied upon in particular by Mr Tschohl and Mr Seitlinger and by the Portuguese Government in their written observations submitted to the Court that there are several methods of electronic communication which do not fall within the scope of Directive 2006/24 or which allow anonymous communication. Whilst, admittedly, that fact is such as to limit the ability of the data retention measure to attain the objective pursued, it is not, however, such as to make that measure inappropriate, as the Advocate General's Opinion. 53. As regards the necessity for the retention of data required by Directive 2006/24, it must be held that the fight against serious crime, in particular against organised crime and terrorism, is indeed of the utmost importance in order to ensure public security and its effectiveness may depend to a great extent on the use of modern investigation techniques. However, such an objective of general interest, however fundamental it may be, does not, in itself, justify a retention measure such as that established by Directive 2006/24 being considered to be necessary for the purpose of that fight. 54. So far as concerns the right to respect for private life, the protection of that fundamental right requires, according to the Court’s settled case-law, in any event, that derogations and limitations in relation to the protection of personal data must apply only in so far as is strictly necessary (Case C 473/12 IPI EU:C:2013:715, paragraph 39 and the case-law cited).