Hey cyber akuma, Long time eh?
Got some good news for you pal, I currently have ALL the ddr games and my backups work fine just by using the psx-change2 disc.
They're knocking around most retailers.
Other than that most protection fixes for the ddr games are on this link
http://www.megagames.com/psx/psx_patches_d.shtml
Hope this helps,
J