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We propose a novel deterministic method for source coding in peer-to-peer networks. The main advantage of our method compared to randomized methods is that the coding will be invertible with probability one. A further advantage is a much lower communication overhead due to special coding vectors. We apply the coding algorithm in a scalable and robust peer-to-peer system. We analyze the deterministic method theoretically and prove upper and lower bounds for the number coded pieces. The theoretical results are backed up by simulations.