2. The controller shall implement appropriate technical and organisational measures ensuring that, by default, only operational personal data which are adequate, relevant and not excessive in relation to the purpose of the processing are processed. That obligation applies to the amount of operational personal data collected, the extent of their processing, the period of their storage and their accessibility. In particular, such measures shall ensure that by default operational personal data are not made accessible without the individual’s intervention to an indefinite number of natural persons.