Restrict access to COM application settings

On a windows 2003 server SP1 in an active directory domain (2003), the
option "edit limit" for security setting on computer global com+ application
security setting are disabled (grey) on. Change can't be done for remote
activation (dcomcnfg). I suspect GPO to have modified these settings but I
don't know where to search.
What are the default GPO which impact these settings? which registry key
can disable this option?
Thanks in advance.

Best regards


Post on french news group in windows.server newsgroup, no answer since one
week.... :-( Is there anybody out there....