The document discusses the evolution and challenges of implementing digital textbooks in Korea, highlighting the transition from traditional to digital formats since 2007. It addresses the significant advancements in digital publishing technologies (like EPUB3) and the convergence of learning technologies such as assessments and online courseware. Additionally, the document outlines the formation of the EduPub project, aimed at creating an open platform for educational content interchange, and presents ongoing efforts to improve annotation and analytics for digital textbooks.