This book describes the whole content of the thesis project titled "Data Loss/Leakage Prevention" in organizational perspective which mainly involves in minimizing the data loss or leakage prevention. The project was carried out during the master program at Lulea Tekniska Universitet, which is called master thesis. This is an ongoing project in a company and was did by two researchers where one researcher who worked for a company have collected real time datas, conducted interview questionnaires, and the other researcher collected datas through video conferencing and email management system....