This book constitutes the refereed proceedings of the 5th International Conference on Multimedia Communications, Services and Security, MCSS 2012, held in Krakow, Poland, in May/June 2012. The 37 revised full papers presented were carefully reviewed and selected from numerous submissions. The papers address issues such as privacy and data protection using digital watermarking and other technologies; object and threat detection; data protection and distribution; human-centric multimedia analysis and synthesis; cybercrime detection and counteracting.