public function canRevertToLive($member = null)
    {
        $owner = $this->owner;

        // Skip if invoked by extendedCan()
        if (func_num_args() > 4) {
            return null;
        }

        // Can't revert if not on live
        if (!$owner->isPublished()) {
            return false;
        }

        if (!$member) {
            $member = Security::getCurrentUser();
        }

        if (Permission::checkMember($member, "ADMIN")) {
            return true;
        }

        // Standard mechanism for accepting permission changes from extensions
        $extended = $owner->extendedCan('canRevertToLive', $member);
        if ($extended !== null) {
            return $extended;
        }

        // Default to canEdit
        return $owner->canEdit($member);
    }