Frankly, this is rubbish. All it's saying is that the likes of Google and Amazon have decided to remove certain works form their PD collections - probably out of caution.
There's absolutely no suggestion that converting a book to PDF, adding a copyright notice, or obtaining an ISBN for it would confer any rights on the person doing it. The only way to obtain a copyright is to create a work, either by writing, painting, photographing, adapting, translating, etc.
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