QDP is an interactive graphics plotting package that began life in the late seventies on a PDP 11/70 at the Goddard Space Flight Center, it doesn't seem that likely that any of code has survived from that first version.
QDP is now an interactive front end to Tim Pearson's PGPLOT package, and is distributed by HEASARC as a stand alone segment of their XANADU X-ray analysis package. Most Starlink sites should have XANADU, and hence QDP, already installed. Ask your site manager, or any random X-ray astronomer if you have one to hand, for site specific instructions on how to setup the package for use. The QDP manual is available on the web.
The Graphics Cookbook