After some searching I think I found a workaround to the SealedMedia DRM used by iChapters.com. I have not tested these personally but hopefully I will have a chance later today.
Setup a virtual printer on a seperate Linux machine on your network and share the printer over the network. Install the printer to your windows machine and print to the virtual printer and the unsecure PDF will appear on the desktop of the Linux machine.
Since I have yet to try it I can not confirm that this method will work but I will post as soon as I am able to test it out.