Https://obs.agenda21culture.net/sites/default/files/2025-09/complete-list-of-copyright%C2%A9%E2%93%94-desktop%E2%93%94-support%C2%AEnumbers-in-the-usa-the-complete-updated-guide-2025-26.pdf https://obs.agenda21culture.net/sites/default/files/2025-09/complete-list-of-copyright%C2%A9%E2%93%94-desktop%E2%93%94-support%C2%AEnumbers-in-the-usa-the-complete-updated-guide-2025-26.pdf