Artic­le 29 Working Par­ty: Opi­ni­on 04/2014 on sur­veil­lan­ce of elec­tro­nic com­mu­ni­ca­ti­ons for intel­li­gence and natio­nal secu­ri­ty purposes

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Opi­ni­on 04/2014 on sur­veil­lan­ce of elec­tro­nic com­mu­ni­ca­ti­ons for intel­li­gence and natio­nal secu­ri­ty purposes: