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•Do not upload content that may be copyrighted where you haven’t obtained the explicity permission to use it in that video.

Fair Use and Fair Dealing
It's possible that you may be permitted to include small excerpts from copyrighted material in your video if what you intend to use is insubstantial or is incidentally included, or where the intended use you have for the copyrighted material falls within a exception or limitation to copyright under the law in your country.

We can't give you advice on either of these topics, and if you do plan to use even a small portion of copyrighted material in your video we'd strongly advise you to take legal advice first.

In the U.S., the following four factors are weighed by courts to determine whether a particular case is fair use:

the purpose and character of the use, (including whether such use is of a commercial nature or is for nonprofit educational purposes)
the nature of the copyrighted work
the amount and substantiality of the portion used in relation to the copyrighted work as a whole
the effect of the use upon the potential market for or value of the copyrighted work
Read more about fair use at the U.S. Copyright Office.

YouTube cannot advise whether or not your video will ultimately qualify as fair use; this is something that can only be decided by a court. It is your responsibility to know the laws in your country, and to understand fair use before you decide to make a video incorporating copyrighted content without permission. If you choose to do so, and your video is removed by the copyright owner, it is even more important that you understand your position before deciding to submit a copyright counter-notification.