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Increasing network choice and service diversity makes choosing the best transport network for a particular communication difficult. A freely operating market has the potential to solve this problem, and the Mobile VCEÂ¿s Digital Marketplace (DMP) is an example of such a system. Short term service contracts can be tendered to network operators in a dynamic and competitive manner down to a call level. While showing great promise, many security concerns involving the various DMP entities remain unresolved. This paper reviews the current sate of the art in electronic marketplaces, and examines the particular security issues and security requirements of the DMP, so as to create a secure service negotiation platform for trading communication services.