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To detect the theft of natural language text effectively, we present a novel scheme to derive birthmark from the text. Since birthmark is a unique and native characteristic of every text, a text with the same birthmark of another can be easily suspected of a copy. Ideally, birthmark should satisfy two properties: (a) credibility - independent texts must be distinguished by completely different birthmarks, and (b) resilience - birthmark should be tolerant against meaningpreserving attacks. To evaluate the effectiveness of the proposed birthmark, we conduct two experiments. The first one shows that birthmark successfully distinguishes non-copied files. In the second one, it shows that birthmark has quite good a tolerance against meaning-preserving attacks.