Restricts Internet Explorer to loading only ActiveX controls from Web pages on sites in the Trusted Sites zone. ActiveX controls ...

"Restricts Internet Explorer to loading only ActiveX controls from Web pages on sites in the Trusted Sites zone. ActiveX controls are objects that are frequently used to add interactivity to Web pages.

If you enable this policy, ActiveX controls from sites that belong to other security zones are not loaded.

If you disable this policy or do not configure it, ActiveX controls from all zones can be loaded, if permitted by the settings for those zones.

This policy is intended to help manage the security of ActiveX controls. To be included in the Trusted Sites zone, Web sites must specifically be added by the administrator or the user on the Security tab of the Internet Options dialog box.

The "Disable the Security page" policy (located in \User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel), which removes the Security tab from the interface, takes precedence over this policy. If it is enabled, this policy is ignored.

Also, see the "Security zones: Use only machine settings" policy."