In [16] asymmetric fingerprinting of data is presented as a new method of copyright protection. The merchant of the data and each buyer interact in such a way that the buyer gets an individually fingerprinted version of the data, while the merchant does not know the version. If the merchant finds an illegally redistributed version of the data he can trace at least one dishonest buyer even if a collusion of c dishonest buyers' versions he cannot cast suspicion on some innocent buyers by redistributing appropriate versions. We present a general construction of an asymmetric fingerprinting scheme based on some arbitrary symmetric fingerprinting scheme. Moreover we give a construction which is more suitable for broadcast data than the constructions presented in [16].
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