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Not all copyrighted material will have these symbols or information on the copyright.  Unless the material specifically gives permission to copy/download and use, you must assume that you cannot.

Copyright Guidelines at a Glance (pdf) provides an easy to read chart describing the usage rights for images, websites, music, video, etc...

Copyright:  Copyright is the law that protects authors or creators of "original works of authorship," including literary, dramatic, musical, artistic and other intellectual works. It allows the author to decide how, when, and where their work can be reproduced and used.

Fair Use:  Fair Use is one means by which copyrighted works can be used under certain circumstances without first obtaining permission of the copyright holder. Fair Use is limited, but flexible, and is commonly used in educational settings.  The "fair use" provision of copyright law isn't a simple yes or no.  There are four factors you should use to evaluate whether a use qualifies as fair:

1. Purpose and character:  Does it have a nonprofit, educational purpose?
2. Nature of the copyrighted work:  What kind of material do you want to use?  Fiction/nonfiction?  Published/unpublished?
3. Amount used:  Are you using a small portion of the copyrighted work?
4. Market effect:  Will your use deprive the author from making money?

Public Domain:  Works in the public domain are not protected by copyright, so you can use them freely.  This includes

• All works published in the US before 1923 
• Works by the US Government or created by its employees as part of their job