I'm still not certain they were copyright violations. A Google search for a sentence in one of those books brings up several websites that have the full text online, for no charge. I'm sure O'Reilly knows how to search Google. Searching for phrases in a website is a common way to find people who've stolen your pages, and as I said, one of those pages has a high Google page rank and has been around for a while. I wouldn't be surprised if O'Reilly knows that they can't do anything about it--not even get Google to delete it from their index--because the site is perfectly legal. Maybe the books aren't copyrighted world-wide, or else copyright law could be different elsewhere.
I removed the links because I believe that despite the law, those books shouldn't be published unless O'Reilly gives permission, and it is possible that a law is being violated. I posted those links in the first place because it was an easy way to get various opinions on what I wanted to know, and I knew I could minimize the damage by quickly deleting them, which probably should have been done by the editors here even before I did it if it was clearly copyright infringement.
And I don't care about votes. I'm considering adding a signature that asks for downvotes.