Copyright Protection for Digital Certificate using Blind Watermarking Technique. Kurdistan Journal of Applied Research, [S. l.], v. 3, n. 1, p. 75–79, 2018. DOI: 10.24017/science.2018.1.15. Disponível em: https://kjar.spu.edu.iq/index.php/kjar/article/view/186.. Acesso em: 8 aug. 2025.