Hi guys, many thanks for your replies. When I try to access an ebook on my cybook it actually displays the PID that I need to add. It just seems that I am not able to read these books (that I have paid for and have a drm pid for) if I transfer them with Calibre. If I transfer them with Mobipocket reader, all is fine.
I think I will look into removing the DRM as a way around this. This is the stupidity of it all. I always buy my ebook in support of the author etc but this bloody DRM is so restrictive and doesn't allow the honest user to do what they would actually like to do with their legitimately bought book
The sooner this madness stops the better. Even bloody iTunes has grasped the idea
Anyway, rant over and thanks for you help guys