Not a lawyer here, and not attempting any offer of legal advice. Location: USA.
I have taken older textbooks that I wanted to keep but did not want to dedicate the shelf space to, generally books printed well before the era of e-books, and had the binding cut off and then scanned the pages to a pdf. I generally go to a Kinkos/Fedex where they cut the binding for typically <$2.
I was told, although I cannot recall where / by whom, that places like Kinkos will only cut the binding if you “certify” that you do not intend to sell or reuse the paper once scanned, under the principle that the book purchase authorizes you to have only one copy and you cannot resell the book IF you are keeping a copy for yourself (which is in contrast to the legality of selling a book you purchased to someone else if you have NOT made a copy first).
I do not have any idea if this is actually true or not, and I have never been asked at Kinkos to make any sort of certification. Since my whole point is to keep an electronic copy and not keep the paper, I just tossed the paper.
My limited understanding of the copyright issue in the US leaves me confused, since I have also seen debates about whether it is legal to rip a CD or DVD that you have purchased so that you can listen to the music or watch the movie on your computer or MP3 player or whatever, with some arguing that you are making an illegal copy and others arguing that if you make that copy for your own personal use, copyright does not restrict HOW you listen to the music that you have purchased. Again, not being a lawyer, I cannot comment intelligently on what the courts might find should a case be brought.
Bottom line is that you can likely find a service that will cut the bindings off for you, at which point you can scan the book to PDF with the document scanner of your choice. Obviously something with an automatic document feeder and reasonably fast scan speed is needed; setting up a rig with a camera (or the Fujitsu book scanner product) seem to me to be way more time and effort than it is worth for a book for a text of any size. You can also, as suggested, use a band saw to cut off the binding if you have access to one and the proper skills. Whether this is legal in your jurisdiction is not is for others to say.