For teachers interested in learning about fair use and the use of media in the classroom the Center for Social Media at American University has some excellent video explanations of fair use. The video I’ve embedded below offers an explanation of fair use as it relates to creating remixes. In addition to the video embedded below the Center for Social Media offers documents about best practices for online video. The Center for Social Media also offers video examples of best practices.

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Here are some related resources that may be of interest to you:
Video Introduction to Understanding Fair Use
Copyright for Educators
The End to Copyright Confusion