Ok, let me explain further:
The library buys a licence to lend out a certain number of copies of the book simultaneously. For the sake of illustration, let's suppose it's 3 copies.
3 people borrow the book, including you, but you remove the DRM from your copy. Your loan expires, and the next person in the queue borrows the book. The library has only purchased a licence for 3 copies of the book, but there are now 4 readable copies: the 3 that are legitimately lent out, and your DRM-stripped copy. You have no legal right to retain your copy beyond the loan period. You are committing copyright infringement if you do so.
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