137Thus, in situations such as those described in paragraphs 135 and 136 of the present judgment, Article 15(1) of Directive 2002/58, read in the light of Articles 7, 8 and 11 and Article 52(1) of the Charter, does not, in principle, preclude a legislative measure which permits the competent authorities to order providers of electronic communications services to retain traffic and location data of all users of electronic communications systems for a limited period of time, as long as there are sufficiently solid grounds for considering that the Member State concerned is confronted with a serious threat, as referred to in paragraphs 135 and 136 of the present judgment, to national security which is shown to be genuine and present or foreseeable. Even if such a measure is applied indiscriminately to all users of electronic communications systems, without there being at first sight any connection, within the meaning of the case-law cited in paragraph 133 of the present judgment, with a threat to the national security of that Member State, it must nevertheless be considered that the existence of that threat is, in itself, capable of establishing that connection.
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