The investigation focuses on the implications of appbooks' materiality on the experience of reading, considering, above all, the protocols of the digital book. The text advances by problematizing the relations that are woven in the constitution of the work to be read from the protocols of edition, authorship and the system, demarcated in the material bases of book objects. Concomitantly, it discusses the protocols in reading and in space that, in turn, tension the object and reading from the traces implied in book objectuality, thus promoting the broadening of the idea that reading, as an experience, transits between the predictable and the undetermined. Conceptual operators of book literature and media are articulated, notably, the notions about reading protocols and work in movement, approximating the notions about the computational pragmatics of new media. In an exploratory approach, based on the literature review, the text indicates that the protocols of the book-system, based on its predictive algorithms, are intensifying the predictability of the reader's choices and the very experience of reading itself, thus pointing to the tension between model and empirical readers, between the protocols of the system and the protocols in the reading, unveiling, furthermore, the disputes that are woven within the book work itself