中文摘要：

在 watermarking 协议介绍的信任第三方将减少安全并且影响协议的实现。在这篇论文，有未信任的第三方(UTTP ) 的一个新 watermarking 协议被建议。基于秘密(ANDOS ) 的想法 ofall-or-nothing 揭发，所有买主，卖主和第三方 didn “ t 知道准确水位标，它为跟踪海盗行为在一个数字内容被嵌入。建议协议提供了机制跟踪海盗行为并且保护顾客“ s 权利。另外，一个卖主与 UTTP 共谋勾结装裱买主的问题，也就是阴谋问题，能被避免。

英文摘要：

A trusted third party introduced in watermarking protocols would decrease the security and affect the implementation of the protocols. In this paper, a new watermarking protocol with an un-trusted third party （UTTP） was proposed. Based on the idea of all-or-nothing disclosure of secret （ANDOS）, all of the buyer, the seller and the third party didn＇t know the exact watermark, which was embedded in a digital content for tracing piracy. The proposed protocol provided mechanisms to trace piracy and protect customer＇s right. In addition, the problem that a seller colluded with UTTP to frame the buyer, namely, the conspiracy problem, could be avoided.