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Re:Publishers File Suit Against Internet Archive by pbhjpbhj on Monday June 01, 2020 @12:51PM (#23380619)
If it says "buy" in the listing and that listing is in any way endorsed by the copyright owner - eg by not issuing a c&d letter - then you own your copy.

Of course much legal machination will be attempted to assert you don't.

YMMV.

Re:Publishers File Suit Against Internet Archive by cornishpixels on Monday June 01, 2020 @02:30PM (#23381968)
It doesn't even matter whether the copyright owner likes it or knows about it or not. Selling a used book is legal.
Re:Publishers File Suit Against Internet Archive by mcguire on Monday June 01, 2020 @03:42PM (#23382829)
You will likely find that the license agreement you paid for, allowing you to use a digital ebook, disagrees.