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Pursuant to the Directive 2002/58 of the European Parliament and of the Council of 12 July 2002 concerning the processing of personal data and the protection of privacy in the electronic communications sector, amended by the Directive 2009/136 of 25 November 2009, the website owner must inform the website user about the purpose of using cookies.
To make yourself familiar with the directives, go to:
Directive 2002/5 of 12 July 2002
Directive 2009/136 of 25 November 2009