Two ways to control security are through Certificate Authorities and Authenticode™.
You can use Certificate Authorities to control the sites where users can download certain content, such as ActiveX controls and Java applets. Site Authorities are a form of digital certificate for an Internet site. Using Authenticode technology, they show where programs come from and verify that they haven't been altered.
You can import these settings from your computer. If you want to modify the settings that you will apply to your users' computers, click Import current Certificate Authorities information, and then click Modify Settings. Certificates can apply to network server authentication, network client authentication, secure e-mail authentication, and software publishing.
You can specify that users can download content only from those sites that you specify. To do this, select the Only trust certificates from listed software publishers check box.
To add a new root certificate, click Add New Root. This provides a level of trust that certificates lower in the hierarchy can inherit. Each certificate is inspected for a parent certificate until it reaches the root certificate.
Authenticode allows you to designate software publishers and credentials agencies as trustworthy. You can also import these settings from your computer. If you want to modify the settings that you will apply to your users' computers, click Import current Authenticode information, and then click Modify Settings.