这是因为DRM技术没有提供允许许可信息交换的协议。

This is because DRM technologies do not have a protocol that allows for the exchange of permission information.

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简单对象访问协议(Simple Object Access Protocol, SOAP)实际上是一种Web服务技术，但Web服务中客户机和服务器之间的数据交换格式是通过灵活的XML模式实现的。

The Simple Object Access Protocol (SOAP) is actually a Web services technology, but the format of data exchange between the client and the server in the Web service is through a flexible XML schema.

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接着，本文对数据交换相关技术进行了总结和分析，引出了数据交换协议的概念。

Then, the paper summarizes and analyzes the relevant technology of the data exchange, and presents the conception of the data exchange protocol.

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