In September, Google agreed to pay a $170 million fine and make privacy changes as regulators said that its YouTube platform had illegally harvested children’s personal information and used it to profit by targeting them with ads. The penalty and changes were part of an agreement with the Federal Trade Commission and the attorney general of New York, which had accused YouTube of violating the federal Children’s Online Privacy Protection Act.

On Monday, YouTube said it was beginning to introduce changes to address regulators’ concerns and better protect children. Here is what you need to know about those changes.

Limited Collection of Digital Data

YouTube said that, starting Monday, it would begin to limit the collection and use of personal information from people who watched children’s videos, no matter the age of the viewer. Federal law prohibits online services aimed at children under 13 from collecting the personal information of those young users without parental consent.

YouTube said it had also turned off or limited some features on children’s videos tied to personal information. These include comments and live-chat features, as well as the ability to save videos to a playlist.