This is achieved via electronically signed contracts and certificates for the use of the web service.
这可通过用电子方式签订关于使用 Web 服务的合同和证书来实现。
At the project level, the new approach may require, for example, migrating from printed, signed off documents to electronically maintained models.
在项目级别，新的方法可能被需要，例如，从打印的、广播的文档向电子占主导地位的模型的变迁。
How will we prove that contracts were signed on a certain date, or that their terms and conditions have not been electronically altered?
我们将如何证明合同是在某个日期签定的，或者证明合同的条款和条件没有通过电子手段进行更改？
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