At present, there are three kinds of traitor tracing schemes against collusion key attack, which are symmetrical traitor tracing schemes and dissymmetrical traitor tracing schemes;
目前，对抗共谋密钥攻击的叛徒追踪方案主要有对称追踪方案、非对称追踪方案、门限追踪方案；
Improved schemes have advantages of nonrepudiation, using insecure channel, against the public key substitution attack and collusion attack etc.
改进后的方案具有不可否认性，不使用安全信道，以及抵抗公钥替换攻击和合谋攻击等优点。
Proposed a pay-TV scheme with user revocation, but it is a private-key scheme, also it does not provide multiple-service capability and meantime can not resist collusion attack.
Mu等人提出了一个可撤销用户的付费电视方案，但其方案是私钥方案，并且没有提供多服务的功能，同时也不能抵抗共谋攻击。
Proposed a pay-TV scheme with user revocation, but it is a private-key scheme, also it does not provide multiple-service capability and meantime can not resist collusion attack.
Mu等人提出了一个可撤销用户的付费电视方案，但其方案是私钥方案，并且没有提供多服务的功能，同时也不能抵抗共谋攻击。
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