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An architecture for dynamic security monitoring and enforcement for client software running in Virtualized Environments for Cloud computing is presented. Monitoring mechanisms check a set of policy-defined conditions at runtime in order to detect threats or anomalous behaviour. Enforcement is achievable by using secure software execution methods that comply with the defined policies. The presented architecture allows for context adaptation of the defined policies by using a new event-sequence language. Such automatic policy runtime enforcement is crucial to achieve proper security in virtualized platforms for cloud computing.