The Author discusses the relationship between the rights of police services to obtain and process information on persons during police investigative operations necessary to the provision of safety and public order and the protection of rights of the individual. According to Art. 8 of the ECHR the interference by a public authority with the exercise of the right to privacy is admissible when it is in accordance with the law and is necessary in a democratic society in the interests of, among others, public safety and for the prevention of crime. The scope of that interference should be broadened (refer to a more extensive sphere) in the case in which the threat to the state’s safety, public safety or economic welfare increases due to terrorist actions. The increase in the crime threat (including terrorist attacks on a scale unknown before in Europe) demands special moderation in legislative actions restricting the rights of police services and of special services in the sphere of investigative operations.