就保密性、完整性和不可否认性来说，一些服务消费者比相同服务的其他消费者有更高的要求。

Some consumers of a service have greater needs than other consumers of the same service for data confidentiality, integrity, and nonrepudiation.

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不可否认性：任何对客户数据的访问都会被记录，同时还保留了公有存储服务的主要优势。

Non-repudiation: any access to customer data is logged, while retaining the main benefits of a public storage service.

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例如，WS - SecurityPolicy可能要求客户机对发送到服务器的请求消息进行签名，这为服务提供不可否认性。

For instance, a WS-SecurityPolicy may require the client to sign request messages sent to the server, providing nonrepudiation for the service.

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