Employing security measures is a common practice for companies. However, some security measures intrude upon personal rights of employees, e.g. privacy, their personal life, or dignity. In these cases their consent is required. But usually there exists quite an imbalance of power and information between both parties. As fundamental rights in certain cases even protect someone from him/herself, not everywhere giving consent is possible. This article discusses different forms of protections in Austria and a common feature, means, properties and their relation, in more detail. As example, filtering personal E-Mail of employees and Intrusion Detection Systems are discussed briefly.