1. Introduction: The Shift from Static PDFs to Interactive Learning In modern education, digital learning materials have replaced traditional printed textbooks in many classrooms. However, most PDF documents remain static by nature, offering limited interactivity for students. Teachers distribute lecture
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Online learning platforms such as Moodle have transformed the way instructors share knowledge with students. However, with this convenience comes a serious concern: digital content leakage. Many educators have faced situations where their carefully prepared PDF lecture notes were copied,