Final answer:
Device driver files should be digitally signed to ensure they are from a trusted publisher, have not been changed after installation, and provide legal protection for the publisher.
Step-by-step explanation:
Device driver files should be digitally signed to ensure that they are from a trusted publisher and have not been changed after installation. Digital signatures provide a way to verify the authenticity and integrity of the driver files.
When a device driver is digitally signed, it means that it has been verified by a trusted certificate authority. This helps to prevent malicious or unauthorized drivers from being installed on a computer, which could potentially harm the system or compromise its security.
A digitally signed driver also provides some legal protection for the publisher. If there are any issues or errors caused by the driver, the publisher can be identified and held accountable.