Cannot backup Ayumi Hamasaki DVD

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I just purchased a copy of an Ayumi Hamasaki DVD on ebay that was released this year. According to the box and auction site, the dvd is region free. It play fine on a stand alone dvd player, but Windows does not recognize the disc when it is inserted, and I get a warning that it is not formatted or not a format compatible with windows. The dvd drive is a TDK 440N DVD-/+ R/RW. I tried it in another machine, and it sees the disc, but will not let me copy any files, even when using DVD Decrypter, DVD X Copy Platinum, Any DVD or Smart Ripper. If I play it on the other machine (which has a Sony DVD-ROM) it plays up until chapter 9 (about 25 minutes into the disc), and then freezes. It plays continuously in the stand alone DVD player and goes to the end without any errors or freeze ups. And all the software says it is not encrypted, but yet it still can not copy the files, wheter using copy software, or just trying to copy in Windows explorer. I'm wondering if perhaps there is a new encryption technology that prevents dvd's from being read by pc dvd-roms, or if anyone else has had this problem. I would really like to watch this disc on my lcd screen, so if anyone has any suggestions, it would be greatly appreciated.