Although most information is protected by copyright, there is an exception. Works within the public domain can be reproduced or used by anyone. However, even though you can use these materials for free, you still must credit the author.
Here are some examples of public domain sources:
|Public Domain Sources:||Examples:|
|Publications of the U.S. Government||U.S. laws and other publications of the Federal government, the U.S. Constitution|
|Copyright has been waived by the author.||Software called freeware|
|Works on which the copyright has expired||Works by William Shakespeare|