Damn DRM!
I am a Vernor Vinge fan. One of my favorite books is his "A Fire Upon the Deep".
For a while I've been aware that there is an annotated edition of it on an obscure, totally impossible to get a copy of CD called The "Electric Science Fiction" 1993 Hugo/Nebula Award Anthology CD. The edition available on that CD claims to contain 500KB of annotations from the author. I, and many others, would very much like to see those annotations, but it seemed they disappeared, along with the CD itself.