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Being a novel P2P system, P2P E-commerce faces all network security issues as ordinary P2P systems do. One of the most severe threats is the imminent worm attacks aiming at P2P systems. Simple definition and taxonomy of P2P worm are presented and characteristics of different types of P2P worm are discussed. The possibility of using P2P system to contain P2P worm is explored, and preliminary countermeasures are proposed. Studying P2P worm will help to prevent P2P E-commerce from leaking sensitive business information, and make P2P E-commerce more robust and resilient.