If your program is a viewer or editor of data—such as a word processor or an image displayer—that data might be from an attacker, so it's an untrusted input.
A document viewer or editor (such as a word processor) probably needs to ensure that viewing the data won't make the program run arbitrary commands.
文档查看器或编辑器(如字处理器)可能需要确保查看数据不会使程序运行任意命令。
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If your program is a viewer or editor of data — such as a word processor or image displayer — that data might be from an attacker, so it's an untrusted input.