If you’re reacting to another creator’s video on YouTube, you may receive a copyright strike for publishing the video. Before downloading a video from YouTube, make sure to seek permission from the creator or owner of the video. Uploading reaction videos to YouTube isn’t illegal, but the video may risk being taken down or demonetized if permission isn’t granted. Always mention the original creator in the video's description. Creators can dispute and appeal reaction video copyright strikes under the making claims section using YouTube’s Copyright Management tool.