A number of people on the play store are dinging Selfie for requiring users to write their name on the copyright page of their books for free/discount ebooks. I am also not a fan of writing in (most) books, but I assume (and will try tonight) that a slip of paper with my name on it (or a transparency) placed on the copyright page for the photo will suffice.
It would also remove the ownership proof the Selfie wants for free/discounts. People could easily use a signature slip at a friends house or the library.