You can protect your pages adding only two lines of code. The script works with a system of invitation codes generated by the administrator. A invitation code is like that : c733055cf4ea45c0b4a176d218d85097. This system is’nt keygenable because the code are activated while the generating. Once the user has activated his code, the invitation code is disabled. The system can generate a total of 8999999999 differents codes.