OK call me paranoid but perhaps the purpose of this persons post was to engage one so that we will say, HA! your wrong thus drawing out the access to information which one may have, i.e., listing all the relevant web sites available so one may attack the next person(s) who have posted this invaluable piece of information.
Some may be calling their "bluff" and that's exactly what they wanted to ferret out any and all web sites that may carry the copy of the book.
Forgive my paranoia but that was the first thing that popped into my head while reading the post.
C
When the pain of being where we are, becomes greater than our fear of letting go...we will risk and heal and grow.