I just checked a book I manually added with a friend to test booklikes search and such because it was an online only from one company technical book (I knew all the authors who had used our company as part of the research) free for download to anyone but until I added to my bookshelf I could not find on booklikes.

Test aborted because it's on amazon for sale (over $20) with exact same cover art but a new author name and company logo.

I just emailed the company and the authors involved in the project to check that they did not authorize the publication for sale on amazon.

I'm not posting (yet) the title or author name in case I was just left out of the loop and it was legitimate.

But, by golly, if someone just downloaded the free book, re-used cover art replacing author and company names to sell as if their very own work without permission -- you betcha I will post the book all over my little bit of the internet.  That's outright piracy and copyright infringement.  And just plain icky.