I recall this being an issue with the Barnett's manuals about 5-6 years ago. If memory serves, one of the forums about bicycles made most of the chapters available just before the manual was re-issued or something like that. I thought that it was kosher, and I looked at some of the important chapters, downloaded them, enjoyed them, and read them again.
Later, when the interested parties had tried to remove them, I recognized that what I had done was wrong. I deleted them immediately. I felt guilty, but soon forgot. But now, you remind me of what I've learned, which cannot be deleted. Soon, when I finish school and get some amazing job (ahemmmm... anybody here in the semiconductor industry?) I'll buy the most recent version, because I know it has value, having enriched my life. If the author's work didn't have value, then why are you reading it and distributing it (and asking, tongue in cheek, for valuables in return)?