Patent Analysis of Digital Goods Management Systems: An Exploratory Study of Technological Innovation, Business Applications, and Strategic Perspectives - US8499009B2. Poornaprajna International Journal of Basic & Applied Sciences (PIJBAS), [S. l.], v. 3, n. 2, p. 204–234, 2026. DOI: 10.64818/PIJBAS.3107.8478.0029. Disponível em: https://www.poornaprajnapublication.com/index.php/pijbs/article/view/274. Acesso em: 12 oct. 2026.