Driver Signing Requirements for Windows
Digital signatures allow administrators and end users who are installing Windows-based software to know whether a legitimate publisher has provided the software package.
In Windows Vista and Windows Server 2008, new features take advantage of code-signing technologies, and new requirements for security in the operating system enforce the use of digital signatures for some kinds of code.
The following digital signature requirements apply for Windows Vista and Windows Server 2008:
Code Signing for Windows Vista
Driver Signing for Windows Operating Systems
Driver Distribution Information on Dashboard