All music, sounds, fonts, images, and videos are owned by somebody. For educational use, some content may be used without explicit consent from the owner under
U.S. Fair Use Laws. Any media listed as
Public Domain is owned by everyone and can be used without restriction. Some media might also be licensed through
Creative Commons (CC) or
other licenses which cover the free use as long as you give the artist credit. Posting of media on-line or in print without consent may be a
Copyright infringement.
