YouTube is a video sharing service provided by Google, and all users must abide by Google's terms of service.
Content You Own
You retain ownership of any intellectual property rights that you hold for content you upload to YouTube. In short, what belongs to you stays yours. However, by using the service, you agree to a worldwide license that enables Google to use, host, store, reproduce, modify and create derivative works and distribute that content for the purpose of operating, promoting, and improving their service.
Please do not post other people's video, audio, or image files to YouTube without their permission. Your account could be suspended by YouTube if you are found to be uploading content without permission. For more information about copyright and actions you can take if your account gets suspended or you would like to file a complaint against someone for infringing on your copyright, visit the YouTube Copyright Infringement Notification Basics webpage.
The following video gives an overview of copyright basics on YouTube.