Improvement of Active Textbook System (A-txt) on Unity Version and Examination of Usage in Consideration of Copyright

Abstract This paper is described on the improvement of the Active Textbook System (A-txt) and the consideration for Copyright Law when the A-txt is used. The A-txt is a next-generation electronic educational material system proposed by the authors that can digitally expand the general paper books with general-purpose terminals. This system is the original system that allows you to easily attach additional digital content to any location by using figures and sentences on paper as augmented reality (AR) markers. Initially, A-txt, which was developed for each type of mobile OS, is provided on a unified platform by using Unity, and it has become possible to concentrate budgets and human resources. This time, we have added new functions to make usability better and improved the screen display by modifying the source code. In addition, as a measure to use figures in books as AR markers without infringing copyright, we experimentally have found the minimum necessary range in which A-txt can be used without inconvenience. In the process, we also have found a method to increase the recognition rate of markers.