The DV module is a set of 2 PCB boards and an expansion bracket with cable and connector that attaches to the DraCo Motion board providing a FireWire input. The core of this DV module is the Sony DVBK-1, which is a board manufactured by Sony and sold to many OEM´s to integrate FireWire into their hardware solutions.
(picture credit: taken from http://www.amiga-hardware.com/)
A curious note, worth mentioning, is that the DraCo DV module has a serious resemblance to the earliest MacroSystem Casablanca NLE FireWire modules.
The big drawback of the DV module is that still, video was handled with the lossy motion-jpeg standart, and video was internally converted from digital to analog, so in the end, it just provides a FireWire video input to the DraCo, but unfortunately loses the benefits of digital video regarding image noise prevention and High Definition resolutions.
Another thing, I almost forgot to mention: support for the DV module starts with Movieshop 4.4