数字水印是嵌入宿主数据中、具有隐蔽性且不容易去除的数字信息。
A digital watermark is the information that is imperceptibly and robustly embedded in the host data such that it cannot be removed.
编写宿主内核和客户内核之间的内核到内核的网络数据包注入（injection）。
Writing kernel-to-kernel network-packet injection between the host kernel and the guest kernel.
最重要的一点是：系统是否会用于服务产品，例如 DHCP、DNS 或代理服务器，或者用于宿主，如数据库或应用程序。
The most important thing to consider is whether the system will be used for any service offering, such as DHCP, DNS, or proxy server, or used for hosting, such as databases or applications.
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