Here's the link for a new report from the Center For Social Media entitled, "Code of Best Practices in Fair Use for Online Video". Believe it or not, it isn't legal to wantonly lift video from the Internet and reuse it. There's a good chance that someone or some thing owns the rights to the piece you lifted.
This report clarifies the legal rights of online video makers and is certain to improve your understanding of fair use.
As their site states, "This document is a code of best practices that helps creators, online providers, copyright holders, and others interested in the making of online video interpret the copyright doctrine of fair use. Fair use is the right to use copyrighted material without permission or payment under some circumstances."
Thanks to KGA for the tip!