38. It should be recalled first of all that the provisions of Directive 95/46, inasmuch as they govern the processing of personal data liable to infringe fundamental freedoms, in particular the right to respect for private life, must necessarily be interpreted in the light of the fundamental rights guaranteed by the Charter (see judgments in Österreichischer Rundfunk and Others, C‑465/00, C‑138/01 and C‑139/01, EU:C:2003:294, paragraph 68; Google Spain and Google, C‑131/12, EU:C:2014:317, paragraph 68; and Ryneš, C‑212/13, EU:C:2014:2428, paragraph 29).

39. It is apparent from Article 1 of Directive 95/46 and recitals 2 and 10 in its preamble that that directive seeks to ensure not only effective and complete protection of the fundamental rights and freedoms of natural persons, in particular the fundamental right to respect for private life with regard to the processing of personal data, but also a high level of protection of those fundamental rights and freedoms. The importance of both the fundamental right to respect for private life, guaranteed by Article 7 of the Charter, and the fundamental right to the protection of personal data, guaranteed by Article 8 thereof, is, moreover, emphasised in the case-law of the Court (see judgments in Rijkeboer, C‑553/07, EU:C:2009:293, paragraph 47; Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraph 53; and Google Spain and Google, C‑131/12, EU:C:2014:317, paragraphs, 53, 66, 74 and the case-law cited).

40. As regards the powers available to the national supervisory authorities in respect of transfers of personal data to third countries, it should be noted that Article 28(1) of Directive 95/46 requires Member States to set up one or more public authorities responsible for monitoring, with complete independence, compliance with EU rules on the protection of individuals with regard to the processing of such data. In addition, that requirement derives from the primary law of the European Union, in particular Article 8(3) of the Charter and Article 16(2) TFEU (see, to this effect, judgments in Commission v Austria, C‑614/10, EU:C:2012:631, paragraph 36, and Commission v Hungary, C‑288/12, EU:C:2014:237, paragraph 47).

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47. As, in accordance with Article 8(3) of the Charter and Article 28 of Directive 95/46, the national supervisory authorities are responsible for monitoring compliance with the EU rules concerning the protection of individuals with regard to the processing of personal data, each of them is therefore vested with the power to check whether a transfer of personal data from its own Member State to a third country complies with the requirements laid down by Directive 95/46.

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53. However, a Commission decision adopted pursuant to Article 25(6) of Directive 95/46, such as Decision 2000/520, cannot prevent persons whose personal data has been or could be transferred to a third country from lodging with the national supervisory authorities a claim, within the meaning of Article 28(4) of that directive, concerning the protection of their rights and freedoms in regard to the processing of that data. Likewise, as the Advocate General has observed in particular in points 61, 93 and 116 of his Opinion, a decision of that nature cannot eliminate or reduce the powers expressly accorded to the national supervisory authorities by Article 8(3) of the Charter and Article 28 of the directive.

54. Neither Article 8(3) of the Charter nor Article 28 of Directive 95/46 excludes from the national supervisory authorities’ sphere of competence the oversight of transfers of personal data to third countries which have been the subject of a Commission decision pursuant to Article 25(6) of Directive 95/46.

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58. If that were not so, persons whose personal data has been or could be transferred to the third country concerned would be denied the right, guaranteed by Article 8(1) and (3) of the Charter, to lodge with the national supervisory authorities a claim for the purpose of protecting their fundamental rights (see, by analogy, judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraph 68).

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64. In a situation where the national supervisory authority comes to the conclusion that the arguments put forward in support of such a claim are unfounded and therefore rejects it, the person who lodged the claim must, as is apparent from the second subparagraph of Article 28(3) of Directive 95/46, read in the light of Article 47 of the Charter, have access to judicial remedies enabling him to challenge such a decision adversely affecting him before the national courts. Having regard to the case-law cited in paragraphs 61 and 62 of the present judgment, those courts must stay proceedings and make a reference to the Court for a preliminary ruling on validity where they consider that one or more grounds for invalidity put forward by the parties or, as the case may be, raised by them of their own motion are well founded (see, to this effect, judgment in T & L Sugars and Sidul Açúcares v Commission, C‑456/13 P, EU:C:2015:284, paragraph 48 and the case-law cited).

65. In the converse situation, where the national supervisory authority considers that the objections advanced by the person who has lodged with it a claim concerning the protection of his rights and freedoms in regard to the processing of his personal data are well founded, that authority must, in accordance with the third indent of the first subparagraph of Article 28(3) of Directive 95/46, read in the light in particular of Article 8(3) of the Charter, be able to engage in legal proceedings. It is incumbent upon the national legislature to provide for legal remedies enabling the national supervisory authority concerned to put forward the objections which it considers well founded before the national courts in order for them, if they share its doubts as to the validity of the Commission decision, to make a reference for a preliminary ruling for the purpose of examination of the decision’s validity.

66. Having regard to the foregoing considerations, the answer to the questions referred is that Article 25(6) of Directive 95/46, read in the light of Articles 7, 8 and 47 of the Charter, must be interpreted as meaning that a decision adopted pursuant to that provision, such as Decision 2000/520, by which the Commission finds that a third country ensures an adequate level of protection, does not prevent a supervisory authority of a Member State, within the meaning of Article 28 of that directive, from examining the claim of a person concerning the protection of his rights and freedoms in regard to the processing of personal data relating to him which has been transferred from a Member State to that third country when that person contends that the law and practices in force in the third country do not ensure an adequate level of protection.

The validity of Decision 2000/520

67. As is apparent from the referring court’s explanations relating to the questions submitted, Mr Schrems contends in the main proceedings that United States law and practice do not ensure an adequate level of protection within the meaning of Article 25 of Directive 95/46. As the Advocate General has observed in points 123 and 124 of his Opinion, Mr Schrems expresses doubts, which the referring court indeed seems essentially to share, concerning the validity of Decision 2000/520. In such circumstances, having regard to what has been held in paragraphs 60 to 63 of the present judgment and in order to give the referring court a full answer, it should be examined whether that decision complies with the requirements stemming from Directive 95/46 read in the light of the Charter.

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72. Thus, Article 25(6) of Directive 95/46 implements the express obligation laid down in Article 8(1) of the Charter to protect personal data and, as the Advocate General has observed in point 139 of his Opinion, is intended to ensure that the high level of that protection continues where personal data is transferred to a third country.

73. The word ‘adequate’ in Article 25(6) of Directive 95/46 admittedly signifies that a third country cannot be required to ensure a level of protection identical to that guaranteed in the EU legal order. However, as the Advocate General has observed in point 141 of his Opinion, the term ‘adequate level of protection’ must be understood as requiring the third country in fact to ensure, by reason of its domestic law or its international commitments, a level of protection of fundamental rights and freedoms that is essentially equivalent to that guaranteed within the European Union by virtue of Directive 95/46 read in the light of the Charter. If there were no such requirement, the objective referred to in the previous paragraph of the present judgment would be disregarded. Furthermore, the high level of protection guaranteed by Directive 95/46 read in the light of the Charter could easily be circumvented by transfers of personal data from the European Union to third countries for the purpose of being processed in those countries.

74. It is clear from the express wording of Article 25(6) of Directive 95/46 that it is the legal order of the third country covered by the Commission decision that must ensure an adequate level of protection. Even though the means to which that third country has recourse, in this connection, for the purpose of ensuring such a level of protection may differ from those employed within the European Union in order to ensure that the requirements stemming from Directive 95/46 read in the light of the Charter are complied with, those means must nevertheless prove, in practice, effective in order to ensure protection essentially equivalent to that guaranteed within the European Union.

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78. In this regard, it must be stated that, in view of, first, the important role played by the protection of personal data in the light of the fundamental right to respect for private life and, secondly, the large number of persons whose fundamental rights are liable to be infringed where personal data is transferred to a third country not ensuring an adequate level of protection, the Commission’s discretion as to the adequacy of the level of protection ensured by a third country is reduced, with the result that review of the requirements stemming from Article 25 of Directive 95/46, read in the light of the Charter, should be strict (see, by analogy, judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraphs 47 and 48).

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91. As regards the level of protection of fundamental rights and freedoms that is guaranteed within the European Union, EU legislation involving interference with the fundamental rights guaranteed by Articles 7 and 8 of the Charter must, according to the Court’s settled case-law, lay down clear and precise rules governing the scope and application of a measure and imposing minimum safeguards, so that the persons whose personal data is concerned have sufficient guarantees enabling their data to be effectively protected against the risk of abuse and against any unlawful access and use of that data. The need for such safeguards is all the greater where personal data is subjected to automatic processing and where there is a significant risk of unlawful access to that data (judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraphs 54 and 55 and the case-law cited).

92. Furthermore and above all, protection of the fundamental right to respect for private life at EU level requires derogations and limitations in relation to the protection of personal data to apply only in so far as is strictly necessary (judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraph 52 and the case-law cited).

93. Legislation is not limited to what is strictly necessary where it authorises, on a generalised basis, storage of all the personal data of all the persons whose data has been transferred from the European Union to the United States without any differentiation, limitation or exception being made in the light of the objective pursued and without an objective criterion being laid down by which to determine the limits of the access of the public authorities to the data, and of its subsequent use, for purposes which are specific, strictly restricted and capable of justifying the interference which both access to that data and its use entail (see, to this effect, concerning Directive 2006/24/EC of the European Parliament and of the Council of 15 March 2006 on the retention of data generated or processed in connection with the provision of publicly available electronic communications services or of public communications networks and amending Directive 2002/58/EC (OJ 2006 L 105, p. 54), judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraphs 57 to 61).

94. In particular, legislation permitting the public authorities to have access on a generalised basis to the content of electronic communications must be regarded as compromising the essence of the fundamental right to respect for private life, as guaranteed by Article 7 of the Charter (see, to this effect, judgment in Digital Rights Ireland and Others, C‑293/12 and C‑594/12, EU:C:2014:238, paragraph 39).

95. Likewise, legislation not providing for any possibility for an individual to pursue legal remedies in order to have access to personal data relating to him, or to obtain the rectification or erasure of such data, does not respect the essence of the fundamental right to effective judicial protection, as enshrined in Article 47 of the Charter. The first paragraph of Article 47 of the Charter requires everyone whose rights and freedoms guaranteed by the law of the European Union are violated to have the right to an effective remedy before a tribunal in compliance with the conditions laid down in that article. The very existence of effective judicial review designed to ensure compliance with provisions of EU law is inherent in the existence of the rule of law (see, to this effect, judgments in Les Verts v Parliament, 294/83, EU:C:1986:166, paragraph 23; Johnston, 222/84, EU:C:1986:206, paragraphs 18 and 19; Heylens and Others, 222/86, EU:C:1987:442, paragraph 14; and UGT-Rioja and Others, C‑428/06 to C‑434/06, EU:C:2008:488, paragraph 80).

96. As has been found in particular in paragraphs 71, 73 and 74 of the present judgment, in order for the Commission to adopt a decision pursuant to Article 25(6) of Directive 95/46, it must find, duly stating reasons, that the third country concerned in fact ensures, by reason of its domestic law or its international commitments, a level of protection of fundamental rights essentially equivalent to that guaranteed in the EU legal order, a level that is apparent in particular from the preceding paragraphs of the present judgment.

97. However, the Commission did not state, in Decision 2000/520, that the United States in fact ‘ensures’ an adequate level of protection by reason of its domestic law or its international commitments.

98. Consequently, without there being any need to examine the content of the safe harbour principles, it is to be concluded that Article 1 of Decision 2000/520 fails to comply with the requirements laid down in Article 25(6) of Directive 95/46, read in the light of the Charter, and that it is accordingly invalid.

Article 3 of Decision 2000/520

99. It is apparent from the considerations set out in paragraphs 53, 57 and 63 of the present judgment that, under Article 28 of Directive 95/46, read in the light in particular of Article 8 of the Charter, the national supervisory authorities must be able to examine, with complete independence, any claim concerning the protection of a person’s rights and freedoms in regard to the processing of personal data relating to him. That is in particular the case where, in bringing such a claim, that person raises questions regarding the compatibility of a Commission decision adopted pursuant to Article 25(6) of that directive with the protection of the privacy and of the fundamental rights and freedoms of individuals.