The advantage of a digitalwrapper 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。
2
For example, a digitalwrapper 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。
3
A digital certificate is basically a wrapper around a public key, which includes identifying information for the party owning that key.