very basic question

[Slowhand]

Stop me if I'm wrong here. As I am understanding this, you can copy PS2 games from the original, if they are on regular cd media. However, some of the games are on dvd media, and they have to be converted, then ripped onto cd media. Am I even close on that one? My question arises from the fact that I have been told that some ps2 games can be copied from the original like the old ps, however some must be ripped from isos like DC. Also, it seems like the newer ps2 games are harder to come by than new DC games used to be. Is it tougher to convert them? For instance, when NBA2k2 came out for DC, the backup version was available on many sites that week. However, games like the new 007, metal gear 2, and the new WWF wrestling game (which have been out for about a month) aren't available yet for PS2. Anyone have any ideas about why this is? I know I just asked a mouthful, but I appreciate any help. Thanks in advance.

Eric