In recent years, the publishing industry has undergone significant change related to the emergence of information technology and communication, leading to the emergence of electronic books substitutes the traditional book. This new reality has an impact on the cultural industry and requires the adaptation of public regulations affecting the production and consumption of eBooks, avoiding situations of tax discrimination against these paper publications, which result in lower consumption thereof, as well as significant tax revenue losses. Since two substitute goods must have the same taxation not vary in response to the medium on which they are distributed.