Automated use and processing of personal data have gained a worldwide popularity today. The age of computerization and new technologies has made the access to personal information as easy and unimpeded as never before. Great flow of personal data within the cyber space raises issues of their effective protection and the appropriate safety measures of the rights of the data subject. Current work provides the examination of automated data processing and measures, which can be applied for their effective protection. As far as the access to personal information raises even more complicated issues in the field of public activities, basic analysis of the book is directed on the examination of the activities performed by the public agencies involved into the investigation of criminal and misdemeanor matters. The analysis should help bodies dealing with automated processing of personal data to avoid possible mistakes and prevent violations of the rights and freedoms of the parties involved into the case management procedures. Creators of new technological means and services may also find important aspects, which help them to guarantee effective protection and safety of information.