However, one area to look out for is using a font to produce a logotype or making the font a prominent part of a (client) brand identity. 'Commercial use' varies very widely with the specific licenses, so it's very hard to give one answer that is correct for all licenses. Part of your service can be assisting them in the process of getting any necessary licenses, if they are not already familiar with it. If you are doing 'work for hire', your licenses do not extend to your clients.
But before your clients can start an ad campaign using them, they might need to obtain a proper license themselves. (Read the detailed license terms to see exactly what is covered by 'commercial use'.)Īs a general principle if you have a commercial license for a font, you can prepare designs for your clients, no problem. However, your client might not be allowed to do so.