Non-stocked by schools? That's literally what is happening. Prevented to be stocked? Library removed? What should we call it when you can legally acquire the

Non-stocked by schools? That's literally what is happening. Prevented to be stocked? Library removed? What should we call it when you can legally acquire the book, read and share it with other people with no concern from the law or authorities whatsoever? Do you think the correct word for this is "banned"?