This is a free version, full support of unlimited signature updates code.

这是一个免费版本，完整支持无限制的代码特征库升级服务。

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These updates happen infrequently, but unfortunately, when they do occur, the signature of the user who enabled the agent cannot be preserved.

这些更新只是偶尔发生，但遗憾的是，当它们发生时，就无法保存启用代理的用户的签名。

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These updates should be at least the products virus signature files. You may also need to update the product's scanning engine as well.

更新文件应该至少包括病毒特征码，最好也能更新该产品的搜索引擎文件。

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And, if you read the fine print, you will discover that in order to get virus signature updates ( a requirement for any AV product), you must have Software Assurance!

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Whitelisting allows only approved files to run, offering significantly more protection for embedded systems than traditional black listing tactics, which depend on continuous updates of signature files in order to remain current.

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