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Peer-to-peer (P2P) information sharing attracts much attention from both legal and IT communities. P2P architectures have the potential to accelerate communication processes and reduce collaboration costs. A prototype, named vuCRN has been developed for researchers to facilitate document sharing legally. However, some legal issues are preventing P2P to realise its real power. In this paper, the design processes of our P2P-based collaborative legal information sharing system are introduced. First P2P information sharing architecture and legal issues are described. Then legal concerns and the next stage of the prototype vuCRN are analysed from ontological level, conceptual level and functional level respectively.