Any DVD that has GIF images or AVI files of the viper scenes is not legit. That's some jackass selling things they found on the internet for free. Don't buy it - if you search around on the internet enough (or on this board), you can find links to download the gifs. Some of the official game GIFs turn up on the
Carrerachan board, too, but its recently been mostly user-created gif-bashes.
That said, there is a VIPER-RSR DVD Edition. It's the same as the CD version of the game but with some extra cutscenes. That may be a little harder to find than the GIFs, becuase it'll be 500-600MB zipped up.
And there are VIPER art books, including one dedicated to VIPER-RSR. It is far and away the most desirable VIPER art book though and one of the rarer ones, so its expensive, even in Japan.
I'm selling a practically new copy with obi for $125 at Sogna Digital Museum. (The one currently on eBay is missing the obi, and probably isn't in as good condition as mine either.)
If you want to know more about the VIPER series in general, particularly what games and products were available, go to
Sogna Digital Museum
