Fair use: using copyrighted material in your videos
Fair use is the right, in some circumstances, to use copyrighted material without asking permission or paying for it. It is a crucial feature of copyright law and what keeps copyright from being censorship. You can invoke fair use when the value to the public of what you are saying outweighs the cost to the private owner of the copyright.
Documentary filmmakers have created, through their professional associations, a clear, easy to understand statement of fair and reasonable approaches to fair use. Download this useful handbook, written by veteran filmmakers to help other filmmakers understand some instances where using copyrighted material without clearance is considered fair use.
Also helpful:
How to Find Out What is in the Public Domain
Professor Peter Hirtle explains when copyrighted material falls into the public domain.
Fair Use: An Essential Feature of Copyright
Hearing testimony by Peter Jaszi explains the legal significance of the doctrine of fair use, for creators, consumers and commerce.
“Yes, You Can!”-Where You Don’t Even Need ‘Fair Use’
This helpful guide by Peter Jaszi offers insight into what falls into the category of free use.

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