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This document "helps creators, online providers, copyright holders, and others interested in the making of online video interpret the copyright doctrine of fair use."
"Discuss[es] the legal implications of using copyrighted music in your videos, and confirm royalty-free, public domain options. We also highlight some of the biggest myths about copyright and music."
Millions of media files free for you to use under a public domain, creative commons, or GNU Free Documentation licenses. This site makes it easy to download, use and cite media.