public static void unregisterPlayer(final String name) {
        final Player p = Bukkit.getPlayer(name);
        if (p != null) {
            final Perm perm = PermManager.getPerm(p);
            if (perm != null) {
                final GroupData data = Config.getGroupConfigData().getGroup(perm.getGroup());
                if (data != null) {
                    recalculate(p, data.getPermissions(), false);
                }
            }
            recalculate(p, Config.getGroupConfigData().getDefaultGroup().getPermissions(), true);
            p.recalculatePermissions();
        }
        PermManager.removePerm(name);
    }
    
     private static void recalculate(final Player p, final ArrayList<String> pex, final boolean bool) {
        final PermissionAttachment attachment = p.addAttachment(SectorPlugin.getPlugin());
        for (final String perm : pex) {
            if (pex.contains("-")) {
                attachment.setPermission(perm, !bool);
                continue;
            }
            attachment.setPermission(perm, bool);
        }
    }