但并不是所有的未签名软件都可以安装，比如不被信任的供应商提供的。
Not all unsigned programs can be installed e. g. if supplier is untrusted.
该证书不仅会标识已签名软件的发行者，还会通过与签发该证书的CA进行核实来验证发行者的身份。
It not only identifies the publisher of the signed software, but it verifies that identity by checking with the CA that signed it.
如果您的目的是验证软件的完整性，就应该下载签名文件。
If you intend to verify the software's integrity, you should download the signature file.
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