Https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/full-list-of-copyright-r-enterprise-support-numbers-in-the-usa.pdf https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/full-list-of-copyright-r-enterprise-support-numbers-in-the-usa.pdf