Abstract: Traitor tracing schemes are very important to secure the distribution of digital content，which indeed aim at protecting content providers from colluding users to build pirate decoders.If such a collusion happens，at least one member of the latter collusion will be detected.Granted bilinear maps，a scheme is proposed which can be against anonymous pirate decoder attack.For this new scheme，a complete proof against collusion attack is provided，based on the bilinear Diffie-Hellman computational assumptions.