It doesn't matter what DBOX it is, its the image, i.e. on Commanda 6, press the DBOX button on remote and from the menu select setitngs, i think (don't have dbox in front to check) but anyway just go through that menu and there is one option there that lets you put a lock on.
You can lock bouquests , usually in the Service menu near the channel scan option,
Select a bouquet and hit dbox button until 'Lock' appears next to blue dot.
However I could still get to all of the channels in the full EPG [red][green]. and it wouldnt be long until the sprogs worked it out.
This was on a Sportster 1.08 RC007.
So to be on the safe side I just created two directories ../zapit/xxx and ./zapit/noxxx
and keep the different versions of services.xml in there. I then just copy up whichever one I need. [Not that there is much point watching UK xxx IMO ]