The old PSX protection could easily stand up to Alcohol 120% or Clone CD.
In fact, there is nothing that either of those programs can do to circumvent that protection.
PSX region-locking and copy-protection works by intentionally burning fake or incorrect data into the subchannel region of the CD. This is something that conventional burners simply aren't capable of, since they'll automatically correct the fake subchannel data. So it's the hardware that is the limitation, not the software.
