Multimedia Content Tracing Scheme Based on Tardos´ Fingerprint Codes

Tardos constructed the optimal probabilistic codes that are ε-secure against c pirates have length O(c² log(1/ε)) and are full power of randomization. Many improved versions of Tardos´ codes are proposed to shorten its code length while they are still not used in multimedia content. In this paper, the multimedia content tracing scheme based on the Tardos´ fingerprint codes is proposed. Before embedding/extracting the Tardos´ in the multimedia content, the fingerprint bit is modulated/demodulated with spread-spectrum modulation and quantization-index modulation. The collusion resistance of the Tardos´ fingerprint based on the different watermark modulation techniques is analyzed. Simulation results show that based on different watermarking modulation technique the collusion resistance of Tardos´ fingerprint is different.