An illegal re-distribution problem is a problem that a regular user who received content re-distributes without legal permutation. This becomes a social problem all over the world. As it is indicated in , this problem has been known since a few or more handred years ago. Boneh and Shaw formalize this problem as collusion-secure fingerprinting (c-secure code) for digital data . After their work, study of c-secure code has become one of popular research stream for information security . One of remarkable results is called Tardos’s code . Tardos’s code achieved to construct approximately optimal length c-secure codes with random coding method.
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