GRAND CHAMBER CASE OF MAGYAR KÉTFARKÚ KUTYA PÁRT v. HUNGARY (Application no. 201/17) JUDGMENT Art 10 • Freedom of expression • Freedom to impart information • Insufficiently foreseeable legal basis for a fine on political party for making available a mobile application allowing voters to share anonymous photographs of their ballot papers • Vagueness of the principle of the ‘exercise of rights in accordance with their purpose’ • Domestic legal framework not ruling out any arbitrariness in its application • Restrictions on the freedom of expression of political parties in the context of an election or a referendum calling for rigorous supervision STRASBOURG 20 January 2020 This judgment is final but it may be subject to editorial revision.

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