International conference on Information technologies (InfoTech-2011) : 15th-16th September 2011, St. St. Constantine and Elena resort (Varna), Bulgaria : proceedings of the 25th international conference on systems for automation of engineering and research (SAER-2011), 7th international workshop on e-Governance and data protection (eG&DP-2011), 1st international workshop on human-computer interaction and eLearning systems (HCIeLS-2011) : [25th anniversary] - Romansky, Radi (State Agency for Information Technology and Communications :, Technical University,., 2011)