You might try DVD Shrink (freeware) and also delete the self serving extra backup notice that 321 studios puts in the movie, they also watermarked your backup. You could also use DVD Decrypter (also freeware) in the file mode and then burn the files with a program such as Nero since you stated that using the ISO mode, which is the easiest way, didn’t work. Since this is a backup you can also use the originals and re-author the whole movie. As Olli suggested you could try CloneDVD (free trial period, I think.) I have seen some backups rejected because of improper disc file structure, but it’s usually the disc itself thatâ€™s being rejected. Make sure that the brand and or type of disc you are using otherwise works in your player. Some players are quite finicky.