If we receive a complete copyright notice about one of your videos, we disable access to it and tell you right away, by email and in your notifications.
This is not a decision that you did anything wrong. The law requires us to take a video down when we receive a complete notice, and we do not judge who is right. Your video and its files are kept. Only public access is switched off.
You receive a copy of the notice. It tells you who sent it, which work they say was copied, and how to reach them. Every notice about your videos is listed on the DMCA claims page in Creator Studio.