DvD Backup's Work in PS2 W/O Modchip.

[onefasteclipse]

About 4 months ago my girlfriend brought a DVD Backup home from one of her Co-workers that she wanted to watch. When I seen it was a backup I new for sure it wasn't going to play in my un-moded PS2. She said that the guy had found a patch that allowed him to play backups in any PS2 without a mod chip. I figured what the hell, lets give it a shot. Sure enough, I poped it in and the movie played away. I was amazed. Now, 4 months later, my girlfriend no longer works there and I finally got a DVD Burner. I've gotten DvDs to play in actual DVD players but just can't find away to get the PS2 to read them. Any of you know how the hell he did that? Thanks.