Copyright issues
When using multimedia works that have been created by others and that are not licensed under a Creative Commons or similar license (a license in which the author grants others the right to use the work under certain conditions), we should assume that the work is an All rights reserved creative work. This means that almost all use of it is protected by law (for example, for the United Kingdom refer to http://www.copyrightservice.co.uk/copyright and for the United States of America, refer to http://www.copyright.com/ccc/viewPage.do?pageCode=cr10-n), and only the copyright author is allowed to make copies, distribute, translate, adapt, and perform other transformative uses for the works. However, there are some limited uses that the law allows, that fit under the "fair use" umbrella. And if we are lucky, the work is in the Public domain, which is another kind of status which means that we won't have a problem in using it! Let's see what these two concepts mean.
Fair use
"Fair...