extracting video recorded on DVD - isobuster

DS had some DVDs with video which were not readable. Apparently they had been recorded with a Toshiba DVD Video recorder DVR17. The DVDs were written, but not finalized, and the session was left open according to Nero. Nero was unable to finalize it because the format is slightly different, since it was written by a hardware DVD player. I tried to get a raw dump of the data using dvdisaster, did not work - dvdisaster needs ECC data from a 'good version' of the disk to start with, I suppose. Then tried the free version of isobuster. It showed the VOB files, but required us to buy the software to extract them. DS ponied up the $30 and we got the files out.