I don't seem to be able to register the book "Information Modeling and Relational Databases, 2nd Edition".
Can you advise please?
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That's probably because it's published by an associate publisher (Elsevier) and not O'Reilly itself. I've noticed that only O'Reilly and No Starch Press titles are "registerable" (and perhaps more imprints, but those are the only ones I've found so far). I've had the same problem trying to register titles from Berrett-Koehler, etc, that show up on the O'Reilly web site but aren't really O'Reilly books.
Perhaps a little "help" page or question-mark blurb on the registration web page would help clear the air about this.