I saw the following over at cps2shock,
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27/10/2002

There seems to be someone making quick hacks of XOR files we have released in the past to get games running which don't currently have XORs. While this sounds a good thing it's actually no different than using the region switch option in kawaks for example. The big problem is that these new XOR's contain incorrect information in relation to what the real encryption would return for many addresses when compared to real hardware.

It also makes it less likely for these games to be donated in the future so good XOR's can be created as people will think they already have good XOR's. The reality is these new hacked XOR's are prone to all the bugs that come with using region switching in CPS2 games.

It's for these reasons that I want it known I have nothing to do with these hacks and I would advise against them being used officially in any emulator as they cannot guarantee an accurate game.

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So does this mean someone may have made some progress on understanding the CPS2 encryption? I'd imagine, its not an easy task to have been able to run unxored program roms using xors from a different country revision. And if anyone's familiar with this, does this hacked xor thing apply to unique unxored games (ie progear)?

Not to sound like a rom whore or anything, I personally couldn't care less for any of the remaining cps2 games...I'm just curious, thats all :)