As far as I’m aware a specific group policy option doesn’t exist, which means editing the registry directly using, par exemple, a login script (…referenced from a group policy)
The specific key is:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\Flags
or si vous want to change the setting for specific users, then:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\Flags
To work out what to set the Flag DWORD to we need to reference this kb article - http://support.microsoft.com/kb/182569 - which I’ll paste verbatim
The Flags DWORD value determines the ability of l’utilisateur to modify the security zone’s properties. To determine the Flags value, add the numbers of the appropriate settings together. The following Flags values are available (decimal):
Value Setting