Ads may appear on your uploaded videos even if you haven’t monetized the videos yourself.
If your video contains content to which you don’t own all necessary rights, the rights holder may have chosen to place ads on it. YouTube may also place ads on videos in channels not in the YouTube Partner Program. Learn more on our blog.
Become a partner and earn revenue from advertising
The YouTube Partner Program is available in many countries/regions, allowing more creators to turn on revenue sharing from ads. To see the benefits of the program, visit the YouTube Partner Program overview page. You can also learn how to become a partner and set up your channel for monetization.
Ads are not appropriate for my videos