Proteus (PROtection TEchnologies for Usable Security) is a research Laboratory of the Software Engineering Group (GISUM) of the University of Málaga formed in 2005. The main activities of GISUM are related to Software Engineering applied to Distributed Systems. GISUM has been awarded the topmost grade (group of excellence) by the Regional Government of Andalusia. The Proteus laboratory focuses on different aspects of Internet security, with special interest in Security Engineering, Software Protection, Security in highly distributed systems (Service-oriented systems, Cloud Computing, Ambient Intelligence, etc.), Access Control and Authorization, among other topics. Members of the Proteus Lab have participated in projects funded by the European Commission in the V and the VI Framework Programme (CASENET, GST, iAccess and SERENITY), as well as in current VII Framework Programme (OKKAM, ASSERT4SOA, PASSIVE, SECFUTUR). Proteus also participates in projects funded by different national entities (Mistico-Mechanics, ConTur, DESEOS, ICES) and in several industry-funded projects.