Where did the book that O’Brien gives to Winston come from?

Explanation:

The book in question is “The Theory and Practice of Oligarchical Collectivism,” with a red-brick dust jacket and gold lettering, written by Emmanuel Goldstein, the alleged arch-enemy of the state in the dystopian world of Oceania in “”.The source of this book is shrouded in mystery as its existence is forbidden, and possession of it is considered a thought-crime punishable by death or torture.