Any recorded work of expression is automatically protected by copyright, meaning you own the rights to it. If you write a letter to your mother, it is automatically copyrighted. So is video, audio, sculptures, paintings, almost anything that is recorded. You'll often see the copyright symbol or the word "copyright" with a date and the person or organization that holds the copyright on the copyrighted work, for example on every page of a book or document. This is to avoid "innocent infringement," so that it is clear that it is copyrighted.