If you are a Business or an Enterprise account holder then your courses will not carry ads. To give your learners an ad free experience as well as to gain branding rights, upgrade to the premium version.
We offer our premium customers a number ways to fully customize and brand their courses, certificates, their online classroom, their payment gateway and many more. They add their custom logo, fonts, colors and create brand awareness and loyalty in their learners.
Related Articles:
How to create, customize and brand a course certificate
How to brand my course
How to remove my course from showing up in Google