Based on the current development state of OTN, The International Telecommunication Union (ITU-T) proposed G.709, Digital Wrapper is the core of this protocol.
针对光传送网的发展状况，国际电信联盟(ITU-T)提出了G．709协议，数字包封技术就是它的核心内容。
参考来源 - 光网络中数字包封技术开销信息的研究与处理·2,447,543篇论文数据，部分数据来源于NoteExpress
The advantage of a digital wrapper is that you can not pull information off the wrapper that tells you about the message content inside.
它的优点是你不能把信息从包装器中提出来，由包装器告诉你里面的信息内容。
For example, a digital wrapper around a demo version of a product could warn the user that there are only a few more USES of the software left before it shuts off.
例如，包在一个产品演示版外的数字包装器可以警告用户，软件再用几次就要关闭了。
A digital certificate is basically a wrapper around a public key, which includes identifying information for the party owning that key.
数字证书实质上就是一个包装公开密匙的包装器，其中包含了用于密匙所有方的识别信息。
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