This document discusses security issues related to cloud computing. It outlines both the pros and cons of cloud-based information and communication technology. The pros include low upfront costs, low maintenance costs, and scalability. However, there are also legal, financial, societal and technical security risks to consider. These include issues around authentication, access control, accountability, and isolation of users. The document then describes the architecture of the Edutain@Grid project, which had four layers: the client layer for single sign-on, the business layer for trust and security federations, the management layer for access control and billing, and the real-time layer for secure application protocols. Finally, it lists the panelists who will discuss challenges