156In the light of the seriousness of the interference entailed by that retention with the fundamental rights enshrined in Articles 7 and 8 of the Charter, only action to combat serious crime, the prevention of serious threats to public security and the safeguarding of national security are capable of justifying that interference. Moreover, the retention period must not exceed what is strictly necessary in the light of the objective pursued. Finally, a measure of that nature must establish strict conditions and safeguards concerning the use of that data, particularly via tracking, with regard to communications made and activities carried out online by the persons concerned.
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