[quiet mike]

No piece of electronic equipment is safe from haking and Nintendo was smart enough to recognize that. They knew that someone along the way will make it posible to hack the GameCube. Knowing this they made sure that the haking of the GameCube will be soo costly that it wouldn't be profitable to do it as a buisiness, just as an expensive hobby.

First of all the media is slightly changed so that no normal DVD player can read it so you need a special one.
A special 128bit encription code is implemented with the code during printing of the medium. This code is an enhancment of Cpcom's 32bit encription code that took 10 years to crack partially.
Now even if you manage to crack the code, you need a CV burner and burn the game on a DVD an read it you still need tho use the medium of smaller size that can fit in the GameCube. You also need to bypass the boot sequence so it won't look for the special implementation in the DVD.

In the end this even though posible in the future, it will still cost to much to seel the burned copies at a competitive price without any waranties, booklets or case.