# The European Union Referendum (Conduct) Regulations 2016, Regulation 12: The official mark


(1) Every ballot paper must contain an appropriate security marking (referred to in these Regulations as the “official mark”).
(2) The official mark must be kept secret.
(3) The counting officer may use a different official mark for different purposes.

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Source: https://www.legislation.gov.uk/ukdsi/2016/9780111142967/regulation/12 (the official version)
Page: https://openlegislation.uk/draft-european-union-referendum-conduct-regulations-2016/regulation-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.