European and American laws require that digital publishers give visitors to their sites and apps information about their use of cookies and other forms of local storage. These laws also require that consent be obtained. A breach of these regulations can result in a fine of up to $500,000.

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More information about the laws and fines

European Commission:
EU legislation on cookies
Belgium:
Commission de la protection de la vie privée ( French | Dutch )
Czech Republic:
Úřad pro ochranu osobních údajů
Denmark:
Guidelines on Executive Order on Information and Consent Required in Case of Storing and Accessing Information in End-User Terminal Equipment
France:
Commission Nationale de l'Informatique et des Libertés
Germany:
EC Communications Committee Working Document on implementation
Greece:
Η χρήση cookies στο διαδίκτυο
Ireland:
Guidance note on Data Protection in the Electronic Communications Sector
Italy:
Garante per la protezione dei dati personali
Luxembourg:
Commission nationale pour la protection des données
Netherlands:
Autoriteit Consument en Markt
Spain:
Agencia de Protección de Datos
UK:
Information Commissioner's Office