15That argument must also be dismissed. It need merely be pointed out that the nature of the aims pursued by the data-processing systems in question is not sufficient to establish that there would be any threat to public policy if companies from other Member States were awarded the contracts for the establishment and operation of those systems. It must also be borne in mind that the confidential nature of the data processed by the systems could be protected, as stated above, by a duty of secrecy, without there being any need to restrict freedom of establishment or freedom to provide services.