Install ActiveX control from specified Web Site using GPO (Group Policy)

Issue: ActiveX control should be installed from Web Site which is in Trusted sites. Other Web sites located in Trusted sites should not be able to install ActiveX controls.

Solution is to enable following two GPO settings:

      Download signed ActiveX Controls for Trusted Sites Zone

      Approved Installation Sites for ActiveX Controls

Source: http://technet.microsoft.com/en-us/library/cc721964(v=ws.10).aspx