ad·ver·tise·ment ˈadvərˌtīzmənt,ədˈvərdizmənt/ noun a notice or announcement in a public medium promoting a product, service, or event or publicizing a job v

ad·ver·tise·ment ˈadvərˌtīzmənt,ədˈvərdizmənt/ noun a notice or announcement in a public medium promoting a product, service, or event or publicizing a job vacancy. --- As long as said 10-second intervals don't promote a product, service or event, and they simply mention that Company X supports PBS, they aren't advertisements. https://www.google.com/search?&rls=en&q=define:advertisement&ie=UTF-8&oe=UTF-8 https://www.google.com/search?&rls=en&q=define:advertisement...