Hehe, ALL GAMES (any platform ie:PSX/Nintendo/PC etc...) are not suppose to be copied, and ALL have their own protection (software/hardware...). But, ALL GAMES WITHOUT EXCEPTION had been/will be copied. All kind of protection is/will be break down. That's a rule : 1 protection = several ways to ripp/hack/crack/emule

The GC hardware protection (from what I know, I don't have a GC) is based on the fact that it's a mini DVD, wich mean contain lot of data in a few space. Actually, the mini CDR (which I suppose compatible with the GC DVD drive) cannot contain more than 150 Mo (i don't remember the exact amount).
To be able to reproduce a game, I think you need to rip it off the mini-DVD, then re-write data on mini-CDR. If you take the music and the movies off, you can decrease the amount of Mo, but it must fit in the ~150Mo....

The best way to by-pass this, would be done if you were able to plug a CDROM-drive to the GC. I asked a few time ago if such a connection would be possible, and I was told that it was not yet.