What's that copy protection? (DDR5th)

[downlo85]

I'm trying to play a backup of Dance Dance Revolution 5th Mix. The game starts loading, but a couple of seconds after the Playstation logo, it goes to a black screen with some words (ie. the copy protection screen). What copy protection is this? Is it mod-chip detection or region detection or what?

I'm using a US PS2 with a Neo2.2 (that's why I needed to play the backup as opposed to the original). I tried using Patch-It for region protection, but it didn't do anything. Direct copy had the same results.