question about privileges

[Herb Lewis]

When running samba 3.6.rc2 I am getting errors trying to change acls
on files on the samba share from an XP client. I notice that samba is
now looking at privileges and I get the following error

create_file_unixpath: open on testadmin.txt failed - SEC_FLAG_SYSTEM_SECURITY denied.
create_file_unixpath: NT_STATUS_PRIVILEGE_NOT_HELD

This didn't happen on my older version of samba because that piece of code
was in an #if 0. Where are these privileges set? Is this something I do
on the DC or something in samba?