Digital watermarking is a key technique for copyright protection and content slight change detection for a multimedia document.

数字水印是多媒体版权保护和内容防篡改的重要手段之一。

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This paper describes an ODA-like multimedia document architecture model, and discusses the representation of the logical architecture and layout architecture.

文中给出一种描述多媒体文档结构的类oda模型，并着重讨论逻辑结构和样式结构的表示方法。

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Discusses the object synchronization problem of several existing multimedia document models, and analyses mostly the synchronization principle of each multimedia object synchronization model.

针对现有的几种多媒体文件模型中的对象同步问题进行了探讨，主要分析了其中多媒体对象同步模型的同步机理。

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