Anti-collusion fingerprinting can identify participants from the forgery digital resources which the multi-user colluded, provides non-repudiation legal evidence in which traitor is sentenced by the law and protects digital resources information security. In this paper, an anti-collusion fingerprinting protocol is designed, and anti-collusion fingerprinting technology is used to solve the digital archives information security problem in public network. The protocol can trace the traitor with extracted fingerprint as legal evidence, effectively solving the problem that the digital archive forensic does’t have the uniqueness, making the traitor non-repudiation before the law. It plays the role of legal punishments and deterrence on illegal digital archive copying and protects the digital archives information security. Tests show the protocol can effectively trace the traitor, no phenomenon of misjudgment happened and no phenomenon of false negatives occurred.