108As regards, in particular, the processing and storage of traffic data by providers of electronic communications services, it is apparent from Article 6 and recitals 22 and 26 of Directive 2002/58 that such processing is permitted only to the extent necessary and for the time necessary for the marketing and billing of services and the provision of value added services. Once that period has elapsed, the data that has been processed and stored must be erased or made anonymous. As regards location data other than traffic data, Article 9(1) of that directive provides that that data may be processed only subject to certain conditions and after it has been made anonymous or the consent of the users or subscribers has been obtained (judgment of 21 December 2016, Tele2, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 86 and the case-law cited).
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