Refi­ne selection:

Goog­le Ana­ly­tics in the crosshairs
Ger­man Fede­ral Govern­ment: rela­ti­ve approach for qua­li­fi­ca­ti­on as per­so­nal data (IP addresses)
FDPIC – E‑Commerce
Artic­le 29 Working Par­ty: Opi­ni­on 9/2014 on the appli­ca­ti­on of Direc­ti­ve 2002/58/EC to device fingerprinting
FDPIC – Eva­lua­ti­on tools for websites
FDPIC – Use of web ana­ly­sis tools for fede­ral bodies