APOLOGY FOR INFRINGEMENT OF COPYRIGHT
Dear Sirs
I am extremely sorry to learn the infringement of your copyright in the.......................................which have been published in my book.
At the time when the publication of the book first commenced I was not at all aware that you are the owner of its copyright and, in fact, until I received your letter of complaint I was completely ignorant of the same. I was first approached only as far back as...........................last when a representative of the..............................offered me the series on certain terms to which I readily agreed more so because the series has been already published in that journal without being aware of the fraud practised on me.
However, I deeply regret for the innocent infringement of your rights and undertake not to publish any more of these series in future in any book, journal, literature or other publications.
                                                           Yours very truly