Maybe a dumb question, but what is the difference between the DVD and HDTV version?
Resolution
Sorry I wasn’t clear, what format is HDTV? I know there are DVD and Bou-Ray discs you can buy but I haven’t heard of an HDTV format disc before.
There are multiple formats that display HD video, but the answer really is “resolution”
Wikipedia said:
While there is no standardized meaning for high-definition, generally any video image with considerably >more than 480 horizontal lines (North America) or 576 horizontal lines (Europe) is considered high->definition.
DVD resolution is 720x480 for NTSC, and 720x576 for PAL, so HD is anything at a higher resolution than that.