5 Direct marketing Section 11 Personal data may not be processed for purposes concerning direct marketing, if the registered person gives notice in writing to the controller of personal data that he/she opposes such processing. Revocation of consent Section 12 In those cases where processing of personal data is only permitted when the registered person has provided his/her consent under Section 10, 15 or 34, the registered person is entitled to revoke at any time consent that has been given. Further personal data about the registered person may not subsequently be processed. A registered person is not entitled, beyond that provided by the first paragraph and Section 11, to oppose such processing of personal data as is permitted under this Act. Prohibition against processing of sensitive personal data Section 13 It is prohibited to process personal data that reveals a) race or ethnic origin, b) political opinions, c) religious or philosophical beliefs, or d) membership of a trade union. It is also prohibited to process such personal data as concerns health or sex life. Information of the kind referred to in the first and second paragraphs is designated as sensitive personal data in this Act. Exemptions from the prohibition of processing sensitive personal data Section 14 Despite the prohibition of Section 13 it is permitted to process sensitive personal data in those cases stated in Sections 15–19. In Section 10 there are provisions concerning the cases in which processing of personal data is not permitted in any case whatsoever. Consent or publicising Section 15 Sensitive personal data may be processed if the registered person has given his/her explicit consent to processing or in a clear manner publicised the information.