A signature driver is a device driver that contains a digital signature. Digital signature is an electronic security token, which can indicate the publisher of the software and whether anyone has changed the original contents of the driver package. If the driver is signed by a publisher who uses a certificate authority to verify its identity, you can be sure that the driver really comes from the publisher and has not been changed.

If the driver is unsigned, signed by a publisher who uses a certificate authority to verify its identity, or has been changed since its release, Windows will warn you with a message.

Extended data:

Windows-related message warning:

1, Windows cannot verify the publisher of this driver.

The driver has not been digitally signed, or its digital signature has not been verified by the certificate authority. If you get the driver from the original manufacturer's CD or system administrator, you should only install the driver.

2.Windows cannot install the driver.

Drivers that are missing a valid digital signature or have been changed after signing cannot be installed on x64-based versions of Windows. Therefore, if you are running an x64-based version of Windows, you will only see this message.

The driver has changed.

The driver has changed after verifying the publisher's digital signature. This software package may have been changed to contain malicious software that may damage your computer or steal information. In rare cases, legitimate publishers will make changes after digitally signing the driver package. If you obtained the changed driver from the original manufacturer's CD, you should only install the software.