This book constitutes the thoroughly refereed post-conference proceedings of the two international workshops DPM 2009, the 4th International Workshop on Data Privacy Management, and SETOP 2009, the Second International Workshop on Autonomous and Spontaneous Security, collocated with the ESORICS 2009 symposium in St. Malo, France, in September 2009.

The 8 revised full papers for DPM 2009, selected from 23 submissions, presented together with two keynote lectures are accompanied by 9 revised full papers of SETOP 2009; all papers were carefully reviewed and selected for inclusion in the book. The DPM 2009 papers cover topics such as privacy in service oriented architectures, privacy-preserving mechanisms, crossmatching and indistinguishability techniques, privacy policies, and disclosure of information. The SETOP 2009 papers address all current issues within the sope of security policies, identification and privacy, as well as security mechanisms.

Peer-to-peer (P2P) has proven as a most successful way to produce large scale, reliable, and cost-effective applications, as illustrated for file sharing or VoIP. P2P storage is an emerging field of application which allows peers to collectively leverage their resources towards ensuring the reliability and availability of user data. Providing assurances in both domains requires not only ensuring the confidentiality and privacy of the data storage process, but also thwarting peer misbehaviour through the introduction of proper security and co-operation enforcement mechanisms. This book highlights how the continuous observation of peer behaviour and monitoring of the storage process is an important requirement to secure a storage system.