Is It Possible To Buy SONY Dvds For The Ps2 console?

[salomonne]

I'm talking about here about the discs on which the games are "inserted".
I don't exactly how the anti-hacking software of the Ps2 is working, but I'm near certain you won't be able to do anything with a random DVD. You NEED the Sony DVD. And that's what I'm looking for, as I'm wishing to have some backup for my games. Nothing illegal, I want some backup in case something happened to the original and I don't want to chip my ps2.

Halp someone?