You Tube - Terms of Use
User Submissions 5B
...You also hereby grant each user of the YouTube Website a non-exclusive license to access your User Submissions through the Website, and to use, reproduce, distribute, prepare derivative works of, display and perform such User Submissions as permitted through the functionality of the Website...
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You put it on YouTube, anyone can use it. :p
You Tube - Terms of Use
User Submissions 5B
...You also hereby grant each user of the YouTube Website a non-exclusive license to access your User Submissions through the Website, and to use, reproduce, distribute, prepare derivative works of...