Dr. Adam Wójtowicz attended two international conferences: The 3rd International Workshop on Information Systems Security Engineering WISSE 2013. and The 25th International Conference on Advanced Information Systems Engineering CAISE 2013, which took place in Valencia (Spain)n June 17 - 21, 2013. During the WISSE conference dr. Wójtowicz presented a paper entitled „Security Model for Large Scale Content Distribution Applied to Federated Virtual Environments”. He served also as a “main discussant” to Christos Kalloniatis presenting a paper "Privacy in the Cloud: Bridging the Gap between Design and Implementation”.