About the PS2 Boot Disc

about the boot cd again, does anyone know about this http://www.ps2-bootdiscs.co.uk/playstation2.htm ?? do they work?? they claim so sure it doesn’t any modification on console.

My second one is, does anyone knows the limitation for the DC boot cd, is there a chance game developer can protect the game from boot disc? there’s one of my import game didn’t work with DC w/ boot disc