Digital Publishing Market Size, Share & Industry Analysis, By Publishing Type (eBooks & Digital Books, Digital Journals, Digital Magazines, Digital News Publishing, Learning & Courseware Publishing, and Others), By Format (eBooks, PDF, and Audio Publishing), By Enterprise Type (Large Enterprises and Small & Medium-sized Enterprises), By End-user (Individual Consumers, Students, Educators and Trainers, and Academic and Research Users), and Regional Forecast, 2026-2034