Originally Posted by Zorz
PDF's are not ebooks btw, they have been around for decades both with and without DRM.
I disagree with this statement. All the O'Reilly books that I've seen, whether in PDF or epub format (and yes, they're out there), began life as a printed, bound book. And most of those that I've seen are not scans either. They can be brought into a PDF editor and manipulated as regular text.
The "P" in PDF stands for portable, btw.
As an aside, if PDF weren't considered a valid ebook format, you probably wouldn't see a PDF subforum right here on mobileread.