actually you don't have the right to restrict the content, except as part of what's allowed in copyright law (those rights a spelt out - like distribution, broadcasting publicly, making derivative works).
specifically, you cannot have the right to restrict me from reading the works, and learning from it.
Imagine a hypothetical scenario - i bought your book, and counted the words and letters to compile some sort of index/table, and published that. Not a very interesting work, but it is transformative, and thus, you do not own copyright to my index/table. You cannot even prevent me from doing the counting and publishing.