Article 3 (necessity, legality and purpose)

• 1

  Police data shall be processed only to the extent necessary for the purposes formulated by or under this Act.

• 2

  Police data shall be processed only to the extent that it is proper and lawful, the data have been lawfully obtained and the data are adequate, relevant and not excessive in relation to the purposes for which they are processed.

• 3

  Police data obtained for a purpose referred to in Section 1(a) may be processed for another purpose referred to in Section 1(a) to the extent that this Act or Union law expressly provides for it and the processing for that other purpose is necessary and proportionate to that purpose.

• 4

  Police data may be processed for a purpose other than those referred to in Article 1(a) by persons and bodies designated by or under the law for a substantial public interest or European Union law.

• 5

  When processing police data under Articles 9, 10 and 12, the origin of such data and the method of acquisition shall be indicated.