Copyright is a form of protection provided by the laws of the United States (Title 17, U.S. Code) to authors. The owner of copyright has the exclusive right to do and authorize the following:
Copyright protection covers both published and unpublished works as well as out-of-print materials. Facts, ideas, procedures, processes, systems, concepts, principles or discoveries cannot be copyrighted. However, some of these can be protected by patent or trade secret laws.
Copyright protection currently lasts for the life of the author plus 70 years. If there is more than one author copyright protection lasts for the life of the last author's death plus 70 years. Copyright protection for materials created by a business may last for 95 years from publication.
The safest course is always to get permission from the copyright owner before using copyrighted material.