Today, personalized services are lucrative for service providers and their customers. With their increasing pervasiveness and interconnection, however, customers show concerns about their privacy. If customers were to refuse the processing of their personal data in general, the economic potential of personalized services could not be realized. We claim that such scepticism is a direct consequence of incomplete control mechanisms. To be in line with laws and to help users to control the usage of their personal data, we propose the Extended Privacy Definition Tool (Ex-PDT) that not only provides customers as well as service providers with a formal language to specify and to compare different policies, but also providers with a monitor tool to enforce the policies within their services.
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