The SecureClassLoader starts by loading the bytes of the class from the appropriate URL and verifying the digital signature of the enclosing archive file, if required.
SecureClassLoader 首先从相应 URL 处装载字节，如果需要还会验证包围文档文件的数字签名。
When IE loads the plugin archive, it will display a warning under the URL about the ActiveX control.
IE加载插件时会在这个ActiveX控件的URL下面显示一条警告信息。
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