2004

Sign Drawings | 787
To turn on or off the Digital Signatures icon display in Windows Explorer
1 In Windows
Explorer, locate a file that has a digital signature icon.
2 Right-click the file name and click Enable/Disable Digital Signature Icons.
3 Click the check box next to Validate Digital Signatures and Display Special
Icons to turn on the icon display in Windows Explorer, or clear the check
box to turn off the icon display.
Note The Digital Signatures icon does not display on some operating sys-
tems, including Windows NT 4.
4 Click OK, log out of Windows, and then log back in.
To prevent signature status from being displayed for valid signatures
1 On the Tools menu, click Options.
2 In the Options dialog box, on the Open and Save tab, clear the Display
Digital Signature Information option.
3 Click OK.
Command line
SIGWARN
Install a Root Certificate
When you receive a file that contains a digital signature from a certificate
authority that is not recognized by your operating system, you may need to
obtain the root certificate (the highest level of certificate in a certificate
chain) before you can determine if the digital ID in the digital signature is
valid.
Digital IDs work on the basis of a trust hierarchy. In a trust hierarchy, the root
certificate is the digital ID of the issuing certificate authority. Popular brows-
ers such as Microsoft Internet Explorer already include the root certificates of
the major certificate vendors, making those digital IDs automatically trusted.
When you receive a file that is signed with a digital ID issued by someone
other than a major vendor (for example, your company’s internal IT
department), you cannot validate the digital ID until you receive the root
certificate.