Central Government Act
Section 499(d) in The Indian Penal Code, 1860
(d) A says of a book published by Z-" Z' s book is foolish; Z must be a weak man. Z' s book is indecent; Z must be a man of impure mind." A is within the exception, if he says this in good faith, inasmuch as the opinion which he expresses of Z respects Z' s character only so far as it appears in Z' s book, and no further.