Copyright strike
What YouTube gives a channel when a copyright owner has one of its videos removed with a legal takedown request. Three active strikes end the channel.
A strike follows a complete and valid removal request from the copyright owner, not an automatic match. It expires after 90 days if you complete Copyright School, and if you believe a video was removed by mistake you can file a counter notification.
It is not the same as a Content ID claim, which is automatic and lets the owner monetize, track or block the video without a strike. Using only material you made, or have the right to use, keeps a channel clear of both.
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