sbi files

Hey, i have a question about sbi files on Playstation 1 games.

Are these sbi files only used on PAL games? Because im collecting the sbi files from redump.org and i want to know if i have only check the PAL (Europe) games? Have NTSC-U and NTSC-J also have sbi files or something like that?

Thanks and sorry for my english.

???

SBI files contain the data stored on PAL discs that lets them get around copy protection checks. They're only important if you plan on emulating PAL versions of PS1 games: games labeled NTSC don't require them.

Actually there are a number of NTSC and NTSC-J games that use Libcrypt protection that sbi files bypass a few of those games never even got a PAL version, it is just more commonly known for PAL games