The digital signature means that the driver has passed the security certification of Microsoft, which ensures its compatibility and reliability. Generally, new drivers (such as BEAT beta) have not passed the witness certificate, but it does not mean that they are not easy to use, but there is no security guarantee. You can choose the way to configure your computer according to your actual needs. Windows may ignore device drivers that are not digitally signed, or send a warning message when it detects device drivers that are not digitally signed (default behavior).