dbook is a tool for developing digital textbooks. Digital textbooks can be created by
importing existing textbooks as image files. Furthermore, interactive drawing tools can
be embedded in the digital textbooks. The textbook data together with the drawing tools
can be used interactively in classrooms.

The following section explains how to prepare the data for creating a digital textbook.
Section 3 describes the functions of the dbook program. Finally, section 4 shows a
typical flow for creating a digital textbook.